Cherry-pick #17028 to 7.x: Ensure pprof endpoint is listening on startup #17081
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Cherry-pick of PR #17028 to 7.x branch. Original message:
pprof HTTP endpoint was being initialized asynchronously. In tests we
have found that sometimes after Metricbeat has started, it fails to
connect to the pprof endpoint. This can happen if the server is not
listening before the rest of the beat is initialized.
This change ensures that the listener for this endpoint is started
before continuing with the rest of the initialization. This should reduce
flakiness of tests that depend on these endpoint (
test_stats
tests).Some comments and error messages have been polished.