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HDFS-8388 added one new metric NNStartedTimeInMillis to get NN start time in milliseconds.
Now based on wheat9 and ajisakaa suggestions now we should deprecate NameNodeMXBean#getNNStarted in branch2 and remove from trunk.
https://issues.apache.org/jira/browse/HDFS-8388?focusedCommentId=14709614&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14709614
https://issues.apache.org/jira/browse/HDFS-8388?focusedCommentId=14726746&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14726746