HOTFIX: Fix null pointer when getting metric value in MetricsReporter#11248

ableegoldman merged 4 commits into

apache:trunkapache/kafka:trunkfrom

PhilHardwick:minor-fix-null-pointer-alive-stream-threads-metricPhilHardwick/kafka:minor-fix-null-pointer-alive-stream-threads-metricCopy head branch name to clipboard