fix(metrics): Only start thread on demand #2727
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The recent metrics-on-by-default switch is causing issues for folks on uWSGI in prefork mode.
In other places where we use threads we always create the thread on demand, but in the metrics code we create a thread right away (so presumably before the process is forked). This PR aligns the behavior.
Additionally, add a small check like we have in the profiler for potential race conditions when spawning the flusher thread.
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