semantic-conventions/docs/http/README.md

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# Semantic conventions for HTTP
**Status**: [Mixed][DocumentStatus]
This document defines semantic conventions for HTTP spans, metrics and logs.
They can be used for http and https schemes
and various HTTP versions like 1.1, 2 and SPDY.
> **Warning**
> Existing HTTP instrumentations that are using
> [v1.20.0 of this document](https://github.com/open-telemetry/opentelemetry-specification/blob/v1.20.0/specification/trace/semantic_conventions/http.md)
> (or prior):
>
> * SHOULD NOT change the version of the HTTP or networking conventions that they emit by default
> until the HTTP semantic conventions are marked stable (HTTP stabilization will
> include stabilization of a core set of networking conventions which are also used
> in HTTP instrumentations). Conventions include, but are not limited to, attributes,
> metric and span names, and unit of measure.
> * SHOULD introduce an environment variable `OTEL_SEMCONV_STABILITY_OPT_IN`
> in the existing major version as a comma-separated list of category-specific values
> (e.g., http, databases, messaging). The list of values includes:
> * `http` - emit the new, stable HTTP and networking conventions,
> and stop emitting the old experimental HTTP and networking conventions
> that the instrumentation emitted previously.
> * `http/dup` - emit both the old and the stable HTTP and networking conventions,
> allowing for a seamless transition.
> * The default behavior (in the absence of one of these values) is to continue
> emitting whatever version of the old experimental HTTP and networking conventions
> the instrumentation was emitting previously.
> * Note: `http/dup` has higher precedence than `http` in case both values are present
> * SHOULD maintain (security patching at a minimum) the existing major version
> for at least six months after it starts emitting both sets of conventions.
> * SHOULD drop the environment variable in the next major version.
Semantic conventions for HTTP are defined for the following signals:
* [HTTP Spans](http-spans.md): Semantic Conventions for HTTP client and server *spans*.
* [HTTP Metrics](http-metrics.md): Semantic Conventions for HTTP client and server *metrics*.
For help migrating from non-stable to stable conventions, see [the migration guide](../non-normative/http-migration.md).
[DocumentStatus]: https://opentelemetry.io/docs/specs/otel/document-status