Disable flag for TracerProvider / MeterProvider

[rajkumar-rangaraj]

Fixes #3455 .

Changes

Added disable flag in MeterProviderBuilderBase and TracerProviderBuilderBase. When disable flag is set, builder will create a default MeterProvider or TracerProvider. From OpenTelemetry Auto-Instrumentation this could be controlled through reflection.

For significant contributions please make sure you have completed the following items:

• Appropriate CHANGELOG.md updated for non-trivial changes
• Design discussion issue #
• Changes in public API reviewed

@open-telemetry/dotnet-instrumentation-approvers , FYI.

[codecov]

Codecov Report

Merging #3583 (55db43f) into main (5208ec0) will decrease coverage by 0.12%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3583      +/-   ##
==========================================
- Coverage   87.35%   87.23%   -0.13%     
==========================================
  Files         282      282              
  Lines       10132    10137       +5     
==========================================
- Hits         8851     8843       -8     
- Misses       1281     1294      +13     

Impacted Files	Coverage Δ
src/OpenTelemetry.Api/Metrics/MeterProvider.cs	100.00% <100.00%> (ø)
.../OpenTelemetry/Metrics/MeterProviderBuilderBase.cs	88.13% <100.00%> (+0.41%)	⬆️
...lemetry/Trace/Builder/TracerProviderBuilderBase.cs	91.96% <100.00%> (+0.14%)	⬆️
src/OpenTelemetry/Logs/Pool/LogRecordSharedPool.cs	78.94% <0.00%> (-21.06%)	⬇️
...tation/OpenTelemetryProtocolExporterEventSource.cs	75.00% <0.00%> (-10.00%)	⬇️
...emetry.Api/Internal/OpenTelemetryApiEventSource.cs	73.52% <0.00%> (-5.89%)	⬇️
...tpListener/Internal/PrometheusCollectionManager.cs	78.04% <0.00%> (-2.44%)	⬇️
src/OpenTelemetry/Logs/OpenTelemetryLogger.cs	86.66% <0.00%> (-2.23%)	⬇️
....Prometheus.HttpListener/PrometheusHttpListener.cs	81.33% <0.00%> (-1.34%)	⬇️
...Telemetry/Internal/SelfDiagnosticsEventListener.cs	97.65% <0.00%> (+0.78%)	⬆️
... and 2 more

[CodeBlanch]

@rajkumar-rangaraj Would you be open to working on this after #3533 is done? I'm in the middle of changing this stuff not totally sure how this will fit in.

[rajkumar-rangaraj]

@rajkumar-rangaraj Would you be open to working on this after #3533 is done? I'm in the middle of changing this stuff not totally sure how this will fit in.

@CodeBlanch sure, I will wait for #3533 to complete.

[github-actions]

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[pellared]

@rajkumar-rangaraj I see that #3533 is merged. Can you please double-check and clarify if it is ready for review?

[reyang]

Is there a scenario where metrics/traces need to be disabled independently?
What is the contract and how to maintain the contract?

[reyang]

Maybe consider something similar to

opentelemetry-dotnet/src/OpenTelemetry/SuppressInstrumentationScope.cs

Lines 25 to 29 in 6b7f2dd

	// An integer value which controls whether instrumentation should be suppressed (disabled).
	// * 0: instrumentation is not suppressed
	// * [int.MinValue, -1]: instrumentation is always suppressed
	// * [1, int.MaxValue]: instrumentation is suppressed in a reference-counting mode
	private static readonly RuntimeContextSlot<int> Slot = RuntimeContext.RegisterSlot<int>("otel.suppress_instrumentation");

.

[rajkumar-rangaraj]

Will be addressed through #3639