(cherry picked from commit d9a07b39046c323d430b98eff6603eaf58e18372) Conflicts: hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
(cherry picked from commit d9a07b39046c323d430b98eff6603eaf58e18372) Conflicts: hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md