Increase metric name maximum length from 63 to 255 characters

[trask]

Pending spec PR open-telemetry/opentelemetry-specification#3648 Spec update is merged!

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02% ⚠️

Comparison is base (076115e) 91.28% compared to head (f5523f2) 91.26%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5697      +/-   ##
============================================
- Coverage     91.28%   91.26%   -0.02%     
- Complexity     5016     5032      +16     
============================================
  Files           554      556       +2     
  Lines         14860    14861       +1     
  Branches       1387     1389       +2     
============================================
- Hits          13565    13563       -2     
- Misses          893      896       +3     
  Partials        402      402              

Files Changed	Coverage Δ
.../main/java/io/opentelemetry/api/metrics/Meter.java	0.00% <ø> (ø)
...in/java/io/opentelemetry/sdk/metrics/SdkMeter.java	98.03% <100.00%> (ø)

... and 26 files with indirect coverage changes

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[jack-berg]

Should hold off on this for 1.29.0 release since this didn't make it into the 1.24.0 spec release.

[trask]

Should hold off on this for 1.29.0 release since this didn't make it into the 1.24.0 spec release.

makes sense based on open-telemetry/opentelemetry-specification#2728 (comment)

[trask]

I'm really hoping this makes it into 1.30.0 🤞🤞