Introduce a Single Threaded Stack Trace Sampler #2341
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…samples for all threads associated with traces that have been selected for snapshotting.
… of StackTrace instances.
…DaemonThreadStackTraceSampler.
…ging in PeriodicallyExportingStagingArea.
…eadStackTraceSampler.
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This PR introduces a
StackTraceSamplerthat utilizes a single thread for taking samples of all threads associated with trace ids that have been selected for snapshotting. This newStackTraceSamplerreplaces the existingScheduledExecutorStackTraceSamplerimplementation which used a 1:1 ratio of sampling thread to trace id approach.