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Review request for mesos. Bugs: MESOS-9178 https://issues.apache.org/jira/browse/MESOS-9178 Repository: mesos Description ------- When an agent is reregistrated, the time delta from that moment to the master elected time was saved; In the progress of reregistration, each data entry represents the registration time delta from master elected time; The percentile of these data as in this metrics can represent overall reregistration progress; In case of degradation towards to the end of reregistration, the high percentile will reflect it. Note: These metrics only represent the completed reregistration; It does not monitor agents were finally marked as unreachable that the reregistration didn't actually happen, the unreachable agents were already monitored by existing metrics. Diffs ----- docs/monitoring.md 00c6ea94bcb73746aef740236632ede123f5b534 src/master/master.cpp 06d769aeba16586a020729d454f4d00688b78c78 src/master/metrics.hpp e1da18e6ba2737f729e1e30653020538150ae898 src/master/metrics.cpp 56a7eef2d279ad3248092d37d19013d3ac110757 Diff: https://reviews.apache.org/r/68706/diff/1/ Testing ------- Thanks, Xudong Ni