semantic-conventions/docs/rpc/grpc.md

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# Semantic conventions for gRPC

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

The Semantic Conventions for [gRPC](https://grpc.io/) extend and override the [RPC spans](rpc-spans.md) and [RPC metrics](rpc-metrics.md) Semantic Conventions
that describe common RPC operations attributes in addition to the Semantic Conventions
described on this page.

## gRPC Attributes

`rpc.system` MUST be set to `"grpc"`.

Below is a table of attributes that SHOULD be included on client and server gRPC measurements.

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| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`rpc.grpc.status_code`](/docs/attributes-registry/rpc.md) | int | The [numeric status code](https://github.com/grpc/grpc/blob/v1.33.2/doc/statuscodes.md) of the gRPC request. | `0`; `1`; `2` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`rpc.grpc.request.metadata.<key>`](/docs/attributes-registry/rpc.md) | string[] | gRPC request metadata, `<key>` being the normalized gRPC Metadata key (lowercase), the value being the metadata values. [1] | `rpc.grpc.request.metadata.my-custom-metadata-attribute=["1.2.3.4", "1.2.3.5"]` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`rpc.grpc.response.metadata.<key>`](/docs/attributes-registry/rpc.md) | string[] | gRPC response metadata, `<key>` being the normalized gRPC Metadata key (lowercase), the value being the metadata values. [2] | `rpc.grpc.response.metadata.my-custom-metadata-attribute=["attribute_value"]` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `rpc.grpc.request.metadata`:** Instrumentations SHOULD require an explicit configuration of which metadata values are to be captured. Including all request metadata values can be a security risk - explicit configuration helps avoid leaking sensitive information.

**[2] `rpc.grpc.response.metadata`:** Instrumentations SHOULD require an explicit configuration of which metadata values are to be captured. Including all response metadata values can be a security risk - explicit configuration helps avoid leaking sensitive information.

---

`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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## gRPC Status

The table below describes when
the [Span Status](https://github.com/open-telemetry/opentelemetry-specification/tree/v1.44.0/specification/trace/api.md#set-status) MUST be set
to `Error` or remain unset
depending on the [gRPC status code](https://github.com/grpc/grpc/blob/v1.33.2/doc/statuscodes.md)
and [Span Kind](https://github.com/open-telemetry/opentelemetry-specification/tree/v1.44.0/specification/trace/api.md#spankind).

| gRPC Status Code | `SpanKind.SERVER` Span Status | `SpanKind.CLIENT` Span Status |
|---|---|---|
| OK | unset | unset |
| CANCELLED | unset | `Error` |
| UNKNOWN | `Error` | `Error`  |
| INVALID_ARGUMENT | unset | `Error` |
| DEADLINE_EXCEEDED | `Error` | `Error` |
| NOT_FOUND | unset | `Error` |
| ALREADY_EXISTS | unset | `Error` |
| PERMISSION_DENIED | unset | `Error` |
| RESOURCE_EXHAUSTED | unset| `Error` |
| FAILED_PRECONDITION | unset | `Error` |
| ABORTED | unset | `Error` |
| OUT_OF_RANGE | unset | `Error` |
| UNIMPLEMENTED | `Error` | `Error` |
| INTERNAL | `Error` | `Error` |
| UNAVAILABLE | `Error` | `Error` |
| DATA_LOSS | `Error` | `Error` |
| UNAUTHENTICATED | unset | `Error` |

[DocumentStatus]: https://opentelemetry.io/docs/specs/otel/document-status