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# Semantic conventions for CouchDB client operations

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

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- [Spans](#spans)
- [Metrics](#metrics)

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The Semantic Conventions for [CouchDB](https://couchdb.apache.org/) extend and override the [Database Semantic Conventions](README.md).

## Spans

Spans representing calls to CouchDB adhere to the general [Semantic Conventions for Database Client Spans](database-spans.md).

`db.system.name` MUST be set to `"couchdb"` and SHOULD be provided **at span creation time**.

The following table outlines the span attributes applicable to CouchDB.

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**Status:** ![Development](https://img.shields.io/badge/-development-blue)

Spans representing calls to CouchDB adhere to the general [Semantic Conventions for Database Client Spans](/docs/database/database-spans.md).

`db.system.name` MUST be set to `"couchdb"` and SHOULD be provided **at span creation time**.

**Span name** SHOULD follow the general [database span name convention](/docs/database/database-spans.md#name)

**Span kind** SHOULD be `CLIENT`.

**Span status** SHOULD follow the [Recording Errors](/docs/general/recording-errors.md) document.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`db.namespace`](/docs/attributes-registry/db.md) | string | The name of the database, fully qualified within the server address and port. | `customers`; `test.users` | `Conditionally Required` If available. | ![Release Candidate](https://img.shields.io/badge/-rc-mediumorchid) |
| [`db.operation.name`](/docs/attributes-registry/db.md) | string | The HTTP method + the target REST route. [1] | `GET /{db}/{docid}` | `Conditionally Required` If readily available. | ![Release Candidate](https://img.shields.io/badge/-rc-mediumorchid) |
| [`db.response.status_code`](/docs/attributes-registry/db.md) | string | The HTTP response code returned by the Couch DB recorded as a string. [2] | `200`; `201`; `429` | `Conditionally Required` [3] | ![Release Candidate](https://img.shields.io/badge/-rc-mediumorchid) |
| [`error.type`](/docs/attributes-registry/error.md) | string | Describes a class of error the operation ended with. [4] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | `Conditionally Required` If and only if the operation failed. | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`server.port`](/docs/attributes-registry/server.md) | int | Server port number. [5] | `80`; `8080`; `443` | `Conditionally Required` [6] | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| [`db.operation.batch.size`](/docs/attributes-registry/db.md) | int | The number of queries included in a batch operation. [7] | `2`; `3`; `4` | `Recommended` | ![Release Candidate](https://img.shields.io/badge/-rc-mediumorchid) |
| [`server.address`](/docs/attributes-registry/server.md) | string | Name of the database host. [8] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | `Recommended` | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |

**[1] `db.operation.name`:** In **CouchDB**, `db.operation.name` should be set to the HTTP method + the target REST route according to the API reference documentation. For example, when retrieving a document, `db.operation.name` would be set to (literally, i.e., without replacing the placeholders with concrete values): [`GET /{db}/{docid}`](https://docs.couchdb.org/en/stable/api/document/common.html#get--db-docid).

**[2] `db.response.status_code`:** HTTP response codes in the 4xx and 5xx range SHOULD be considered errors.

**[3] `db.response.status_code`:** If response was received and the HTTP response code is available.

**[4] `error.type`:** The `error.type` SHOULD match the `db.response.status_code` returned by the database or the client library, or the canonical name of exception that occurred.
When using canonical exception type name, instrumentation SHOULD do the best effort to report the most relevant type. For example, if the original exception is wrapped into a generic one, the original exception SHOULD be preferred.
Instrumentations SHOULD document how `error.type` is populated.

**[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.

**[6] `server.port`:** If using a port other than the default port for this DBMS and if `server.address` is set.

**[7] `db.operation.batch.size`:** Operations are only considered batches when they contain two or more operations, and so `db.operation.batch.size` SHOULD never be `1`.

**[8] `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.

The following attributes can be important for making sampling decisions
and SHOULD be provided **at span creation time** (if provided at all):

* [`db.namespace`](/docs/attributes-registry/db.md)
* [`db.operation.name`](/docs/attributes-registry/db.md)
* [`server.address`](/docs/attributes-registry/server.md)
* [`server.port`](/docs/attributes-registry/server.md)

---

`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) |

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## Metrics

CouchDB client instrumentations SHOULD collect metrics according to the general
[Semantic Conventions for Database Client Metrics](database-metrics.md).

`db.system.name` MUST be set to `"couchdb"`.

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