Prepare for v0.15.0 release

[jtescher]

No description provided.

[codecov]

Codecov Report

Merging #572 (2f3dacd) into main (6834b64) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main    #572   +/-   ##
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  Coverage   54.7%   54.7%           
=====================================
  Files        101     101           
  Lines       8668    8668           
=====================================
  Hits        4745    4745           
  Misses      3923    3923           

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[TommyCpp]

LGTM 🎉

Just need to regenerate the grpc file.

[TommyCpp]

One thing that we may want to change is the current OTLP metric exporter is broken in some cases because the collector hasn't updated to the latest version.

For the record, the proto submodule has to be checked out to commit 8ab21ed9a to have it working.

Maybe we should downgrade first to match the collector?

[jtescher]

@TommyCpp should we merge this now? could be nice to have a little more time to consider #571

[TommyCpp]

I think it's good to merge as it is. The only two things that could be added is:

• Figure out how to address the inconsistency with collector metrics, I am still looking at options to lock the commit of submodule but don't think I can get it done tonight.
• feat: add default resource in TracerProvider if user didn't provide one. #571, Maybe we should give feat: add default resource in TracerProvider if user didn't provide one. #571 more time to consider all possibilities. It's not an urgent feature and probably can land in the next release?