Stabilize synchronous gauge

[jack-berg]

Synchronous gauges are now stable in the spec: open-telemetry/opentelemetry-specification#4019

Resolves #5795.

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 90.90%. Comparing base (0d2d67e) to head (9608301).

Files	Patch %	Lines
.../opentelemetry/api/metrics/DoubleGaugeBuilder.java	0.00%	1 Missing ⚠️
...io/opentelemetry/api/metrics/LongGaugeBuilder.java	0.00%	1 Missing ⚠️
...a/io/opentelemetry/sdk/metrics/SdkDoubleGauge.java	66.66%	1 Missing ⚠️
...ava/io/opentelemetry/sdk/metrics/SdkLongGauge.java	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6419      +/-   ##
============================================
- Coverage     90.92%   90.90%   -0.02%     
- Complexity     6165     6167       +2     
============================================
  Files           678      678              
  Lines         18453    18484      +31     
  Branches       1812     1813       +1     
============================================
+ Hits          16778    16803      +25     
- Misses         1141     1146       +5     
- Partials        534      535       +1     

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[trask]

Maybe something about how only the most recent one is exported, since I think that part of synchronous gauges is most likely to trip people up?

[jack-berg]

I'll add a comment to that effect.

[jkwatson]

Thanks!