[sdk-metrics] Add support for .NET 9 Advice API

[rajkumar-rangaraj]

Fixes #5487
Design discussion issue #

Changes

Please provide a brief description of the changes here.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.29%. Comparing base (6250307) to head (0dec04c).
Report is 324 commits behind head on main.

Files with missing lines	Patch %	Lines
src/OpenTelemetry/Metrics/MetricStreamIdentity.cs	95.65%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5854      +/-   ##
==========================================
+ Coverage   83.38%   86.29%   +2.91%     
==========================================
  Files         297      257      -40     
  Lines       12531    11194    -1337     
==========================================
- Hits        10449     9660     -789     
+ Misses       2082     1534     -548     

Flag	Coverage Δ
unittests	?
unittests-Project-Experimental	86.27% <95.65%> (?)
unittests-Project-Stable	86.24% <95.65%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/OpenTelemetry/Metrics/MetricStreamIdentity.cs	88.98% <95.65%> (+2.31%)	⬆️

... and 225 files with indirect coverage changes

[cijothomas]

@rajkumar-rangaraj Do you know if httpclient, aspnetcore started leveraging the advice for providing custom buckets ?

[rajkumar-rangaraj]

@rajkumar-rangaraj Do you know if httpclient, aspnetcore started leveraging the advice for providing custom buckets ?

I haven't checked this part yet.

[CodeBlanch]

Definitely need a CHANGELOG for this one 😄

[cijothomas]

@rajkumar-rangaraj Do you know if httpclient, aspnetcore started leveraging the advice for providing custom buckets ?

I haven't checked this part yet.

np! We just need to make sure we don't remove the hardcoded buckets that exist today in sdk, until that happens and old versions are out of support.

[cijothomas]

Definitely need a CHANGELOG for this one 😄

I also suggest to document this near https:/open-telemetry/opentelemetry-dotnet/tree/main/docs/metrics/customizing-the-sdk#explicit-bucket-histogram-aggregation and recommend users to leverage Advice, wherever feasible

[rajkumar-rangaraj]

@rajkumar-rangaraj Do you know if httpclient, aspnetcore started leveraging the advice for providing custom buckets ?

I haven't checked this part yet.

np! We just need to make sure we don't remove the hardcoded buckets that exist today in sdk, until that happens and old versions are out of support.

Created an issue to track doc changes separately - #5855