Fix metric export interval to match spec

[svetlanabrennan]

The spec says export interval should be 60000 milliseconds and this pr fixes this for the otlp metric exporter.

Changes

Please provide a brief description of the changes here.

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

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

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Svetlana Brennan (dc9d2fb)

[reyang]

Why would a console exporter use the periodic exporting strategy by default?

[alanwest]

Ah, yes that makes sense now. The side-effect of this change causing the console exporter to default to periodic exporting was not immediately obvious.

opentelemetry-dotnet/src/OpenTelemetry.Exporter.Console/ConsoleExporterMetricsExtensions.cs

Lines 42 to 44 in 6e6afdb

	var reader = options.MetricExportIntervalMilliseconds == Timeout.Infinite
	? new BaseExportingMetricReader(exporter)
	: new PeriodicExportingMetricReader(exporter, options.MetricExportIntervalMilliseconds);

My gut says it would make sense to decouple the idea of periodic vs. non-periodic in a separate config setting. Kinda similar to how tracing has the batch exporter options.

[alanwest]

Maybe break this into two PRs... because I think the change to the OTLP exporter is correct.

[svetlanabrennan]

Ok. I broke it up.

[codecov]

Codecov Report

Merging #2641 (9924dd3) into main (66d2621) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

❗ Current head 9924dd3 differs from pull request most recent head 508a0fd. Consider uploading reports for the commit 508a0fd to get more accurate results

@@            Coverage Diff             @@
##             main    #2641      +/-   ##
==========================================
- Coverage   80.97%   80.92%   -0.05%     
==========================================
  Files         243      243              
  Lines        8547     8547              
==========================================
- Hits         6921     6917       -4     
- Misses       1626     1630       +4     

Impacted Files	Coverage Δ
...orter.OpenTelemetryProtocol/OtlpExporterOptions.cs	100.00% <100.00%> (ø)
...ZPages/Implementation/ZPagesExporterEventSource.cs	56.25% <0.00%> (-6.25%)	⬇️
...ter.ZPages/Implementation/ZPagesActivityTracker.cs	97.14% <0.00%> (-2.86%)	⬇️
...nTelemetry/Internal/OpenTelemetrySdkEventSource.cs	73.33% <0.00%> (-0.96%)	⬇️
...Telemetry/Internal/SelfDiagnosticsEventListener.cs	96.87% <0.00%> (-0.79%)	⬇️

[reyang]

LGTM.

[cijothomas]

@svetlanabrennan Could you update the description as it is outdated now? The linked issue require separate handling, so that may be removed.