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linkTitle: SDK Metrics
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# Semantic conventions for OpenTelemetry SDK metrics

**Status**: [Development][DocumentStatus]

This document describes metrics emitted by the OpenTelemetry SDK components themselves about their internal state.

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- [Span metrics](#span-metrics)
  - [Metric: `otel.sdk.span.live`](#metric-otelsdkspanlive)
  - [Metric: `otel.sdk.span.started`](#metric-otelsdkspanstarted)
  - [Metric: `otel.sdk.processor.span.queue.size`](#metric-otelsdkprocessorspanqueuesize)
  - [Metric: `otel.sdk.processor.span.queue.capacity`](#metric-otelsdkprocessorspanqueuecapacity)
  - [Metric: `otel.sdk.processor.span.processed`](#metric-otelsdkprocessorspanprocessed)
  - [Metric: `otel.sdk.exporter.span.inflight`](#metric-otelsdkexporterspaninflight)
  - [Metric: `otel.sdk.exporter.span.exported`](#metric-otelsdkexporterspanexported)
- [Log metrics](#log-metrics)
  - [Metric: `otel.sdk.log.created`](#metric-otelsdklogcreated)
  - [Metric: `otel.sdk.processor.log.queue.size`](#metric-otelsdkprocessorlogqueuesize)
  - [Metric: `otel.sdk.processor.log.queue.capacity`](#metric-otelsdkprocessorlogqueuecapacity)
  - [Metric: `otel.sdk.processor.log.processed`](#metric-otelsdkprocessorlogprocessed)
  - [Metric: `otel.sdk.exporter.log.inflight`](#metric-otelsdkexporterloginflight)
  - [Metric: `otel.sdk.exporter.log.exported`](#metric-otelsdkexporterlogexported)
- [Metric metrics](#metric-metrics)
  - [Metric: `otel.sdk.exporter.metric_data_point.inflight`](#metric-otelsdkexportermetric_data_pointinflight)
  - [Metric: `otel.sdk.exporter.metric_data_point.exported`](#metric-otelsdkexportermetric_data_pointexported)
- [Operation Metrics](#operation-metrics)
  - [Metric: `otel.sdk.metric_reader.collection.duration`](#metric-otelsdkmetric_readercollectionduration)
  - [Metric: `otel.sdk.exporter.operation.duration`](#metric-otelsdkexporteroperationduration)

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## Span metrics

### Metric: `otel.sdk.span.live`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.span.live` | UpDownCounter | `{span}` | The number of created spans with `recording=true` for which the end operation has not been called yet. | ![Development](https://img.shields.io/badge/-development-blue) |  |

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`otel.span.sampling_result`](/docs/registry/attributes/otel.md) | string | The result value of the sampler for this span | `DROP`; `RECORD_ONLY`; `RECORD_AND_SAMPLE` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

---

`otel.span.sampling_result` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `DROP` | The span is not sampled and not recording | ![Development](https://img.shields.io/badge/-development-blue) |
| `RECORD_AND_SAMPLE` | The span is sampled and recording | ![Development](https://img.shields.io/badge/-development-blue) |
| `RECORD_ONLY` | The span is not sampled, but recording | ![Development](https://img.shields.io/badge/-development-blue) |

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### Metric: `otel.sdk.span.started`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.span.started` | Counter | `{span}` | The number of created spans. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** Implementations MUST record this metric for all spans, even for non-recording ones.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`otel.span.parent.origin`](/docs/registry/attributes/otel.md) | string | Determines whether the span has a parent span, and if so, [whether it is a remote parent](https://opentelemetry.io/docs/specs/otel/trace/api/#isremote) | `none`; `local`; `remote` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.span.sampling_result`](/docs/registry/attributes/otel.md) | string | The result value of the sampler for this span | `DROP`; `RECORD_ONLY`; `RECORD_AND_SAMPLE` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

---

`otel.span.parent.origin` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `local` | The span has a parent and the parent's span context [isRemote()](https://opentelemetry.io/docs/specs/otel/trace/api/#isremote) is false | ![Development](https://img.shields.io/badge/-development-blue) |
| `none` | The span does not have a parent, it is a root span | ![Development](https://img.shields.io/badge/-development-blue) |
| `remote` | The span has a parent and the parent's span context [isRemote()](https://opentelemetry.io/docs/specs/otel/trace/api/#isremote) is true | ![Development](https://img.shields.io/badge/-development-blue) |

---

`otel.span.sampling_result` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `DROP` | The span is not sampled and not recording | ![Development](https://img.shields.io/badge/-development-blue) |
| `RECORD_AND_SAMPLE` | The span is sampled and recording | ![Development](https://img.shields.io/badge/-development-blue) |
| `RECORD_ONLY` | The span is not sampled, but recording | ![Development](https://img.shields.io/badge/-development-blue) |

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### Metric: `otel.sdk.processor.span.queue.size`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.processor.span.queue.size` | UpDownCounter | `{span}` | The number of spans in the queue of a given instance of an SDK span processor. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** Only applies to span processors which use a queue, e.g. the SDK Batching Span Processor.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [1] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [2] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[2] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

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### Metric: `otel.sdk.processor.span.queue.capacity`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.processor.span.queue.capacity` | UpDownCounter | `{span}` | The maximum number of spans the queue of a given instance of an SDK span processor can hold. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** Only applies to span processors which use a queue, e.g. the SDK Batching Span Processor.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [1] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [2] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[2] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

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### Metric: `otel.sdk.processor.span.processed`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.processor.span.processed` | Counter | `{span}` | The number of spans for which the processing has finished, either successful or failed. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** For successful processing, `error.type` MUST NOT be set. For failed processing, `error.type` MUST contain the failure cause.
For the SDK Simple and Batching Span Processor a span is considered to be processed already when it has been submitted to the exporter, not when the corresponding export call has finished.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`error.type`](/docs/registry/attributes/error.md) | string | A low-cardinality description of the failure reason. SDK Batching Span Processors MUST use `queue_full` for spans dropped due to a full queue. [1] | `queue_full` | `Recommended` | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [2] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [3] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `error.type`:** The `error.type` SHOULD be predictable, and SHOULD have low cardinality.

When `error.type` is set to a type (e.g., an exception type), its
canonical class name identifying the type within the artifact SHOULD be used.

Instrumentations SHOULD document the list of errors they report.

The cardinality of `error.type` within one instrumentation library SHOULD be low.
Telemetry consumers that aggregate data from multiple instrumentation libraries and applications
should be prepared for `error.type` to have high cardinality at query time when no
additional filters are applied.

If the operation has completed successfully, instrumentations SHOULD NOT set `error.type`.

If a specific domain defines its own set of error identifiers (such as HTTP or gRPC status codes),
it's RECOMMENDED to:

- Use a domain-specific attribute
- Set `error.type` to capture all errors, regardless of whether they are defined within the domain-specific set or not.

**[2] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[3] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

---

`error.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `_OTHER` | A fallback error value to be used when the instrumentation doesn't define a custom value. | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

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### Metric: `otel.sdk.exporter.span.inflight`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.exporter.span.inflight` | UpDownCounter | `{span}` | The number of spans which were passed to the exporter, but that have not been exported yet (neither successful, nor failed). [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** For successful exports, `error.type` MUST NOT be set. For failed exports, `error.type` MUST contain the failure cause.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [1] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [2] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`server.address`](/docs/registry/attributes/server.md) | string | Server domain name if available without reverse DNS lookup; otherwise, IP address or Unix domain socket name. [3] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`server.port`](/docs/registry/attributes/server.md) | int | Server port number. [4] | `80`; `8080`; `443` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

**[1] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[2] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

**[3] `server.address`:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent the server address behind any intermediaries, for example proxies, if it's available.

**[4] `server.port`:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries, for example proxies, if it's available.

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

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<!-- endsemconv -->

### Metric: `otel.sdk.exporter.span.exported`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.exporter.span.exported` | Counter | `{span}` | The number of spans for which the export has finished, either successful or failed. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** For successful exports, `error.type` MUST NOT be set. For failed exports, `error.type` MUST contain the failure cause.
For exporters with partial success semantics (e.g. OTLP with `rejected_spans`), rejected spans MUST count as failed and only non-rejected spans count as success.
If no rejection reason is available, `rejected` SHOULD be used as value for `error.type`.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`error.type`](/docs/registry/attributes/error.md) | string | Describes a class of error the operation ended with. [1] | `rejected`; `timeout`; `500`; `java.net.UnknownHostException` | `Recommended` | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [2] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [3] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`server.address`](/docs/registry/attributes/server.md) | string | Server domain name if available without reverse DNS lookup; otherwise, IP address or Unix domain socket name. [4] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`server.port`](/docs/registry/attributes/server.md) | int | Server port number. [5] | `80`; `8080`; `443` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

**[1] `error.type`:** The `error.type` SHOULD be predictable, and SHOULD have low cardinality.

When `error.type` is set to a type (e.g., an exception type), its
canonical class name identifying the type within the artifact SHOULD be used.

Instrumentations SHOULD document the list of errors they report.

The cardinality of `error.type` within one instrumentation library SHOULD be low.
Telemetry consumers that aggregate data from multiple instrumentation libraries and applications
should be prepared for `error.type` to have high cardinality at query time when no
additional filters are applied.

If the operation has completed successfully, instrumentations SHOULD NOT set `error.type`.

If a specific domain defines its own set of error identifiers (such as HTTP or gRPC status codes),
it's RECOMMENDED to:

- Use a domain-specific attribute
- Set `error.type` to capture all errors, regardless of whether they are defined within the domain-specific set or not.

**[2] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[3] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

**[4] `server.address`:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent the server address behind any intermediaries, for example proxies, if it's available.

**[5] `server.port`:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries, for example proxies, if it's available.

---

`error.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `_OTHER` | A fallback error value to be used when the instrumentation doesn't define a custom value. | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

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<!-- endsemconv -->

## Log metrics

### Metric: `otel.sdk.log.created`

This metric is [recommended][MetricRecommended].

<!-- semconv metric.otel.sdk.log.created -->
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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.log.created` | Counter | `{log_record}` | The number of logs submitted to enabled SDK Loggers. | ![Development](https://img.shields.io/badge/-development-blue) |  |

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<!-- endsemconv -->

### Metric: `otel.sdk.processor.log.queue.size`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.processor.log.queue.size` | UpDownCounter | `{log_record}` | The number of log records in the queue of a given instance of an SDK log processor. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** Only applies to log record processors which use a queue, e.g. the SDK Batching Log Record Processor.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [1] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [2] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[2] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

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<!-- endsemconv -->

### Metric: `otel.sdk.processor.log.queue.capacity`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.processor.log.queue.capacity` | UpDownCounter | `{log_record}` | The maximum number of log records the queue of a given instance of an SDK Log Record processor can hold. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** Only applies to Log Record processors which use a queue, e.g. the SDK Batching Log Record Processor.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [1] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [2] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[2] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

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<!-- endsemconv -->

### Metric: `otel.sdk.processor.log.processed`

This metric is [recommended][MetricRecommended].

<!-- semconv metric.otel.sdk.processor.log.processed -->
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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.processor.log.processed` | Counter | `{log_record}` | The number of log records for which the processing has finished, either successful or failed. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** For successful processing, `error.type` MUST NOT be set. For failed processing, `error.type` MUST contain the failure cause.
For the SDK Simple and Batching Log Record Processor a log record is considered to be processed already when it has been submitted to the exporter,
not when the corresponding export call has finished.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`error.type`](/docs/registry/attributes/error.md) | string | A low-cardinality description of the failure reason. SDK Batching Log Record Processors MUST use `queue_full` for log records dropped due to a full queue. [1] | `queue_full` | `Recommended` | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [2] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [3] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `error.type`:** The `error.type` SHOULD be predictable, and SHOULD have low cardinality.

When `error.type` is set to a type (e.g., an exception type), its
canonical class name identifying the type within the artifact SHOULD be used.

Instrumentations SHOULD document the list of errors they report.

The cardinality of `error.type` within one instrumentation library SHOULD be low.
Telemetry consumers that aggregate data from multiple instrumentation libraries and applications
should be prepared for `error.type` to have high cardinality at query time when no
additional filters are applied.

If the operation has completed successfully, instrumentations SHOULD NOT set `error.type`.

If a specific domain defines its own set of error identifiers (such as HTTP or gRPC status codes),
it's RECOMMENDED to:

- Use a domain-specific attribute
- Set `error.type` to capture all errors, regardless of whether they are defined within the domain-specific set or not.

**[2] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[3] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

---

`error.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `_OTHER` | A fallback error value to be used when the instrumentation doesn't define a custom value. | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

<!-- markdownlint-restore -->
<!-- prettier-ignore-end -->
<!-- END AUTOGENERATED TEXT -->
<!-- endsemconv -->

### Metric: `otel.sdk.exporter.log.inflight`

This metric is [recommended][MetricRecommended].

<!-- semconv metric.otel.sdk.exporter.log.inflight -->
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<!-- markdownlint-disable -->

| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.exporter.log.inflight` | UpDownCounter | `{log_record}` | The number of log records which were passed to the exporter, but that have not been exported yet (neither successful, nor failed). [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** For successful exports, `error.type` MUST NOT be set. For failed exports, `error.type` MUST contain the failure cause.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [1] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [2] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`server.address`](/docs/registry/attributes/server.md) | string | Server domain name if available without reverse DNS lookup; otherwise, IP address or Unix domain socket name. [3] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`server.port`](/docs/registry/attributes/server.md) | int | Server port number. [4] | `80`; `8080`; `443` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

**[1] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[2] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

**[3] `server.address`:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent the server address behind any intermediaries, for example proxies, if it's available.

**[4] `server.port`:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries, for example proxies, if it's available.

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

<!-- markdownlint-restore -->
<!-- prettier-ignore-end -->
<!-- END AUTOGENERATED TEXT -->
<!-- endsemconv -->

### Metric: `otel.sdk.exporter.log.exported`

This metric is [recommended][MetricRecommended].

<!-- semconv metric.otel.sdk.exporter.log.exported -->
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<!-- see templates/registry/markdown/snippet.md.j2 -->
<!-- prettier-ignore-start -->
<!-- markdownlint-capture -->
<!-- markdownlint-disable -->

| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.exporter.log.exported` | Counter | `{log_record}` | The number of log records for which the export has finished, either successful or failed. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** For successful exports, `error.type` MUST NOT be set. For failed exports, `error.type` MUST contain the failure cause.
For exporters with partial success semantics (e.g. OTLP with `rejected_log_records`), rejected log records MUST count as failed and only non-rejected log records count as success.
If no rejection reason is available, `rejected` SHOULD be used as value for `error.type`.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`error.type`](/docs/registry/attributes/error.md) | string | Describes a class of error the operation ended with. [1] | `rejected`; `timeout`; `500`; `java.net.UnknownHostException` | `Recommended` | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [2] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [3] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`server.address`](/docs/registry/attributes/server.md) | string | Server domain name if available without reverse DNS lookup; otherwise, IP address or Unix domain socket name. [4] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`server.port`](/docs/registry/attributes/server.md) | int | Server port number. [5] | `80`; `8080`; `443` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

**[1] `error.type`:** The `error.type` SHOULD be predictable, and SHOULD have low cardinality.

When `error.type` is set to a type (e.g., an exception type), its
canonical class name identifying the type within the artifact SHOULD be used.

Instrumentations SHOULD document the list of errors they report.

The cardinality of `error.type` within one instrumentation library SHOULD be low.
Telemetry consumers that aggregate data from multiple instrumentation libraries and applications
should be prepared for `error.type` to have high cardinality at query time when no
additional filters are applied.

If the operation has completed successfully, instrumentations SHOULD NOT set `error.type`.

If a specific domain defines its own set of error identifiers (such as HTTP or gRPC status codes),
it's RECOMMENDED to:

- Use a domain-specific attribute
- Set `error.type` to capture all errors, regardless of whether they are defined within the domain-specific set or not.

**[2] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[3] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

**[4] `server.address`:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent the server address behind any intermediaries, for example proxies, if it's available.

**[5] `server.port`:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries, for example proxies, if it's available.

---

`error.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `_OTHER` | A fallback error value to be used when the instrumentation doesn't define a custom value. | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

<!-- markdownlint-restore -->
<!-- prettier-ignore-end -->
<!-- END AUTOGENERATED TEXT -->
<!-- endsemconv -->

## Metric metrics

### Metric: `otel.sdk.exporter.metric_data_point.inflight`

This metric is [recommended][MetricRecommended].

<!-- semconv metric.otel.sdk.exporter.metric_data_point.inflight -->
<!-- NOTE: THIS TEXT IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
<!-- see templates/registry/markdown/snippet.md.j2 -->
<!-- prettier-ignore-start -->
<!-- markdownlint-capture -->
<!-- markdownlint-disable -->

| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.exporter.metric_data_point.inflight` | UpDownCounter | `{data_point}` | The number of metric data points which were passed to the exporter, but that have not been exported yet (neither successful, nor failed). [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** For successful exports, `error.type` MUST NOT be set. For failed exports, `error.type` MUST contain the failure cause.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [1] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [2] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`server.address`](/docs/registry/attributes/server.md) | string | Server domain name if available without reverse DNS lookup; otherwise, IP address or Unix domain socket name. [3] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`server.port`](/docs/registry/attributes/server.md) | int | Server port number. [4] | `80`; `8080`; `443` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

**[1] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[2] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

**[3] `server.address`:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent the server address behind any intermediaries, for example proxies, if it's available.

**[4] `server.port`:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries, for example proxies, if it's available.

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

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### Metric: `otel.sdk.exporter.metric_data_point.exported`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.exporter.metric_data_point.exported` | Counter | `{data_point}` | The number of metric data points for which the export has finished, either successful or failed. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** For successful exports, `error.type` MUST NOT be set. For failed exports, `error.type` MUST contain the failure cause.
For exporters with partial success semantics (e.g. OTLP with `rejected_data_points`), rejected data points MUST count as failed and only non-rejected data points count as success.
If no rejection reason is available, `rejected` SHOULD be used as value for `error.type`.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`error.type`](/docs/registry/attributes/error.md) | string | Describes a class of error the operation ended with. [1] | `rejected`; `timeout`; `500`; `java.net.UnknownHostException` | `Recommended` | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [2] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [3] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`server.address`](/docs/registry/attributes/server.md) | string | Server domain name if available without reverse DNS lookup; otherwise, IP address or Unix domain socket name. [4] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`server.port`](/docs/registry/attributes/server.md) | int | Server port number. [5] | `80`; `8080`; `443` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

**[1] `error.type`:** The `error.type` SHOULD be predictable, and SHOULD have low cardinality.

When `error.type` is set to a type (e.g., an exception type), its
canonical class name identifying the type within the artifact SHOULD be used.

Instrumentations SHOULD document the list of errors they report.

The cardinality of `error.type` within one instrumentation library SHOULD be low.
Telemetry consumers that aggregate data from multiple instrumentation libraries and applications
should be prepared for `error.type` to have high cardinality at query time when no
additional filters are applied.

If the operation has completed successfully, instrumentations SHOULD NOT set `error.type`.

If a specific domain defines its own set of error identifiers (such as HTTP or gRPC status codes),
it's RECOMMENDED to:

- Use a domain-specific attribute
- Set `error.type` to capture all errors, regardless of whether they are defined within the domain-specific set or not.

**[2] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[3] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

**[4] `server.address`:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent the server address behind any intermediaries, for example proxies, if it's available.

**[5] `server.port`:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries, for example proxies, if it's available.

---

`error.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `_OTHER` | A fallback error value to be used when the instrumentation doesn't define a custom value. | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

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<!-- endsemconv -->

## Operation Metrics

### Metric: `otel.sdk.metric_reader.collection.duration`

This metric is [recommended][MetricRecommended].

This metric SHOULD be specified with
[`ExplicitBucketBoundaries`](https://github.com/open-telemetry/opentelemetry-specification/tree/v1.42.0/specification/metrics/api.md#instrument-advisory-parameters)
with a single bucket with no boundaries.

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.metric_reader.collection.duration` | Histogram | `s` | The duration of the collect operation of the metric reader. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** For successful collections, `error.type` MUST NOT be set. For failed collections, `error.type` SHOULD contain the failure cause.
It can happen that metrics collection is successful for some MetricProducers, while others fail. In that case `error.type` SHOULD be set to any of the failure causes.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`error.type`](/docs/registry/attributes/error.md) | string | Describes a class of error the operation ended with. [1] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | `Recommended` | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [2] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [3] | `batching_span_processor`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `error.type`:** The `error.type` SHOULD be predictable, and SHOULD have low cardinality.

When `error.type` is set to a type (e.g., an exception type), its
canonical class name identifying the type within the artifact SHOULD be used.

Instrumentations SHOULD document the list of errors they report.

The cardinality of `error.type` within one instrumentation library SHOULD be low.
Telemetry consumers that aggregate data from multiple instrumentation libraries and applications
should be prepared for `error.type` to have high cardinality at query time when no
additional filters are applied.

If the operation has completed successfully, instrumentations SHOULD NOT set `error.type`.

If a specific domain defines its own set of error identifiers (such as HTTP or gRPC status codes),
it's RECOMMENDED to:

- Use a domain-specific attribute
- Set `error.type` to capture all errors, regardless of whether they are defined within the domain-specific set or not.

**[2] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[3] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

---

`error.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `_OTHER` | A fallback error value to be used when the instrumentation doesn't define a custom value. | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

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<!-- endsemconv -->

### Metric: `otel.sdk.exporter.operation.duration`

This metric is [recommended][MetricRecommended].

This metric SHOULD be specified with
[`ExplicitBucketBoundaries`](https://github.com/open-telemetry/opentelemetry-specification/tree/v1.42.0/specification/metrics/api.md#instrument-advisory-parameters)
with a single bucket with no boundaries.

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `otel.sdk.exporter.operation.duration` | Histogram | `s` | The duration of exporting a batch of telemetry records. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** This metric defines successful operations using the full success definitions for [http](https://github.com/open-telemetry/opentelemetry-proto/blob/v1.5.0/docs/specification.md#full-success-1)
and [grpc](https://github.com/open-telemetry/opentelemetry-proto/blob/v1.5.0/docs/specification.md#full-success). Anything else is defined as an unsuccessful operation. For successful
operations, `error.type` MUST NOT be set. For unsuccessful export operations, `error.type` MUST contain a relevant failure cause.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`error.type`](/docs/registry/attributes/error.md) | string | Describes a class of error the operation ended with. [1] | `rejected`; `timeout`; `500`; `java.net.UnknownHostException` | `Conditionally Required` If operation has ended with an error | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`http.response.status_code`](/docs/registry/attributes/http.md) | int | The HTTP status code of the last HTTP request performed in scope of this export call. | `200` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`otel.component.name`](/docs/registry/attributes/otel.md) | string | A name uniquely identifying the instance of the OpenTelemetry component within its containing SDK instance. [2] | `otlp_grpc_span_exporter/0`; `custom-name` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`otel.component.type`](/docs/registry/attributes/otel.md) | string | A name identifying the type of the OpenTelemetry component. [3] | `otlp_grpc_span_exporter`; `com.example.MySpanExporter` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`rpc.grpc.status_code`](/docs/registry/attributes/rpc.md) | int | The gRPC status code of the last gRPC requests performed in scope of this export call. | `0`; `1`; `2` | `Recommended` when applicable | ![Development](https://img.shields.io/badge/-development-blue) |
| [`server.address`](/docs/registry/attributes/server.md) | string | Server domain name if available without reverse DNS lookup; otherwise, IP address or Unix domain socket name. [4] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`server.port`](/docs/registry/attributes/server.md) | int | Server port number. [5] | `80`; `8080`; `443` | `Recommended` when applicable | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

**[1] `error.type`:** The `error.type` SHOULD be predictable, and SHOULD have low cardinality.

When `error.type` is set to a type (e.g., an exception type), its
canonical class name identifying the type within the artifact SHOULD be used.

Instrumentations SHOULD document the list of errors they report.

The cardinality of `error.type` within one instrumentation library SHOULD be low.
Telemetry consumers that aggregate data from multiple instrumentation libraries and applications
should be prepared for `error.type` to have high cardinality at query time when no
additional filters are applied.

If the operation has completed successfully, instrumentations SHOULD NOT set `error.type`.

If a specific domain defines its own set of error identifiers (such as HTTP or gRPC status codes),
it's RECOMMENDED to:

- Use a domain-specific attribute
- Set `error.type` to capture all errors, regardless of whether they are defined within the domain-specific set or not.

**[2] `otel.component.name`:** Implementations SHOULD ensure a low cardinality for this attribute, even across application or SDK restarts.
E.g. implementations MUST NOT use UUIDs as values for this attribute.

Implementations MAY achieve these goals by following a `<otel.component.type>/<instance-counter>` pattern, e.g. `batching_span_processor/0`.
Hereby `otel.component.type` refers to the corresponding attribute value of the component.

The value of `instance-counter` MAY be automatically assigned by the component and uniqueness within the enclosing SDK instance MUST be guaranteed.
For example, `<instance-counter>` MAY be implemented by using a monotonically increasing counter (starting with `0`), which is incremented every time an
instance of the given component type is started.

With this implementation, for example the first Batching Span Processor would have `batching_span_processor/0`
as `otel.component.name`, the second one `batching_span_processor/1` and so on.
These values will therefore be reused in the case of an application restart.

**[3] `otel.component.type`:** If none of the standardized values apply, implementations SHOULD use the language-defined name of the type.
E.g. for Java the fully qualified classname SHOULD be used in this case.

**[4] `server.address`:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent the server address behind any intermediaries, for example proxies, if it's available.

**[5] `server.port`:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries, for example proxies, if it's available.

---

`error.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `_OTHER` | A fallback error value to be used when the instrumentation doesn't define a custom value. | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

---

`otel.component.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `batching_log_processor` | The builtin SDK batching log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `batching_span_processor` | The builtin SDK batching span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_log_exporter` | OTLP log record exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_metric_exporter` | OTLP metric exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_grpc_span_exporter` | OTLP span exporter over gRPC with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_log_exporter` | OTLP log record exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_metric_exporter` | OTLP metric exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_json_span_exporter` | OTLP span exporter over HTTP with JSON serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_log_exporter` | OTLP log record exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_metric_exporter` | OTLP metric exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `otlp_http_span_exporter` | OTLP span exporter over HTTP with protobuf serialization | ![Development](https://img.shields.io/badge/-development-blue) |
| `periodic_metric_reader` | The builtin SDK periodically exporting metric reader | ![Development](https://img.shields.io/badge/-development-blue) |
| `prometheus_http_text_metric_exporter` | Prometheus metric exporter over HTTP with the default text-based format | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_log_processor` | The builtin SDK simple log record processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `simple_span_processor` | The builtin SDK simple span processor | ![Development](https://img.shields.io/badge/-development-blue) |
| `zipkin_http_span_exporter` | Zipkin span exporter over HTTP | ![Development](https://img.shields.io/badge/-development-blue) |

---

`rpc.grpc.status_code` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `0` | OK | ![Development](https://img.shields.io/badge/-development-blue) |
| `1` | CANCELLED | ![Development](https://img.shields.io/badge/-development-blue) |
| `2` | UNKNOWN | ![Development](https://img.shields.io/badge/-development-blue) |
| `3` | INVALID_ARGUMENT | ![Development](https://img.shields.io/badge/-development-blue) |
| `4` | DEADLINE_EXCEEDED | ![Development](https://img.shields.io/badge/-development-blue) |
| `5` | NOT_FOUND | ![Development](https://img.shields.io/badge/-development-blue) |
| `6` | ALREADY_EXISTS | ![Development](https://img.shields.io/badge/-development-blue) |
| `7` | PERMISSION_DENIED | ![Development](https://img.shields.io/badge/-development-blue) |
| `8` | RESOURCE_EXHAUSTED | ![Development](https://img.shields.io/badge/-development-blue) |
| `9` | FAILED_PRECONDITION | ![Development](https://img.shields.io/badge/-development-blue) |
| `10` | ABORTED | ![Development](https://img.shields.io/badge/-development-blue) |
| `11` | OUT_OF_RANGE | ![Development](https://img.shields.io/badge/-development-blue) |
| `12` | UNIMPLEMENTED | ![Development](https://img.shields.io/badge/-development-blue) |
| `13` | INTERNAL | ![Development](https://img.shields.io/badge/-development-blue) |
| `14` | UNAVAILABLE | ![Development](https://img.shields.io/badge/-development-blue) |
| `15` | DATA_LOSS | ![Development](https://img.shields.io/badge/-development-blue) |
| `16` | UNAUTHENTICATED | ![Development](https://img.shields.io/badge/-development-blue) |

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<!-- endsemconv -->

[DocumentStatus]: https://opentelemetry.io/docs/specs/otel/document-status
[MetricRecommended]: /docs/general/metric-requirement-level.md#recommended
