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# Semantic conventions for GraphQL server

**Status**: [Experimental][DocumentStatus]

This document defines semantic conventions to apply when instrumenting the GraphQL implementation. They map GraphQL
operations to attributes on a Span.

The **span name** SHOULD be of the format `{graphql.operation.type}` provided
`graphql.operation.type` is available. If `graphql.operation.type` is not available,
the span SHOULD be named `GraphQL Operation`.

> **Warning**
> The `graphql.operation.name` value is provided by the client and can have high
> cardinality. Using it in the GraphQL server span name (by default) is
> NOT RECOMMENDED.
>
> Instrumentation MAY provide a configuration option to enable a more descriptive
> span name following `{graphql.operation.type} {graphql.operation.name}` format
> when `graphql.operation.name` is available.

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| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`graphql.document`](/docs/attributes-registry/graphql.md) | string | The GraphQL document being executed. [1] | `query findBookById { bookById(id: ?) { name } }` | `Recommended` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
| [`graphql.operation.name`](/docs/attributes-registry/graphql.md) | string | The name of the operation being executed. | `findBookById` | `Recommended` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
| [`graphql.operation.type`](/docs/attributes-registry/graphql.md) | string | The type of the operation being executed. | `query`; `mutation`; `subscription` | `Recommended` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |

**[1] `graphql.document`:** The value may be sanitized to exclude sensitive information.

---

`graphql.operation.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 |
|---|---|---|
| `mutation` | GraphQL mutation | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
| `query` | GraphQL query | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
| `subscription` | GraphQL subscription | ![Experimental](https://img.shields.io/badge/-experimental-blue) |

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