SAMZA-2764: add the metric "container-active-threads" back #1638
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Symptom
No data was emitted for the metric
container-active-threads
Cause
This PR(#1501 ) removed the logic to emit data for metric accidently: https://github.com/apache/samza/pull/1501/files#diff-f79781ad4c55ae7860829b06fd9dfd15e8069c37e64f8854d8f27ca2cd1f3ee5L637
Changes
SamzaContainerMonitorListener
Tests