Mark initial set of HTTP semantic conventions as frozen

[trask]

Fixes open-telemetry/opentelemetry-specification#3279

[reyang]

Hopefully this is the last PR for https://github.com/orgs/open-telemetry/projects/41/views/4.

[pellared]

I kindly suggest taking a look at #128 before going Stable.

When I read feature-freeze definition I feel that it may be too late. Hopefully, I am wrong.

Personally, I do not feel comfortable that so many attributes are marked as Required and their values may contain PII. Take notice that it may not be easy to use a Collector to get rid of the attributes e.g. "mobile" instrumentation (Android, iOS).

[reyang]

When I read feature-freeze definition I feel that it may be too late. Hopefully, I am wrong.

https://github.com/open-telemetry/opentelemetry-specification/blob/v1.21.0/specification/document-status.md#feature-freeze

Changes that address production issues with existing features are still accepted.

[pellared]

Changes that address production issues with existing features are still accepted.

I just want to share that the example of "mobile instrumentation" and PII is a real problem for one of our customers 😉

I do not have capacity to propose any PR in the following days (maybe even weeks). But I proposed some ideas in #128

[Oberon00]

Changes that address production issues with existing features are still accepted.

I don't think this is meant for new production issues and critical things. Otherwise a missing feature could also cause production issues.

[Oberon00]

If we want to address PII things, we need to lift the feature freeze (I think this will happen after stabilization is complete & released?)

[jack-berg]

@trask what does it mean for a metric to have both experimental and Feature freeze simultaneously?

[reyang]

Feature-freeze is orthogonal to Experimental/Stable https://github.com/open-telemetry/opentelemetry-specification/blob/ad1537a46eb856eeb915786fd7cf81e07bdeb426/specification/document-status.md?plain=1#L19.

(personally I find it counter intuitive - since only "Experimental", "Experimental + Feature-freeze" and "Stable" would make sense)