Metrics are non conformant to semantic conventions

[sk-]

Description

Two of the metrics provided by the otelhttp package don't follow the semantic conventions. These metrics:

• http.server.response_content_length which should be called http.server.request.body.size and be an histogram (see spec)
  http.server.request_content_length which should be called http.server.response.body.size and be an histogram (see spec

Expected behavior

The otelhttp package (and all packages in this repo) should follow the semantic conventions.

[MadVikingGod]

That was changed in the 1.21 and later version of the semantic convention. Currently, otelhttp is on 1.20, which uses http.request_content_length

There is work that needs to be done to be able to transition from 1.20 to later, because of the introduced breaking changes in the semantic convention, but should resolve this issue with it.

[dashpole]

@MadVikingGod is there an issue tracking the work that needs to be done to get past the breaking changes in semconv? It looks like we do have v1.23.1 generated: open-telemetry/opentelemetry-go#4749

[danilobuerger]

The metric names have been changed, but haven't been migrated to histogram