Review Request 60957: Added a time window for Timer metrics.

[James Peach]

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Review request for mesos, Benjamin Mahler, Kevin Klues, and Jiang Yan Xu.


Bugs: MESOS-6918
    https://issues.apache.org/jira/browse/MESOS-6918


Repository: mesos


Description
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Added a time window argument for the Timer metrics that were missing it.


Diffs
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  src/master/registrar.cpp 242cd0a4f1fad327dcc1a59260f46987cfeba59c 
  src/state/log.cpp b71383906cf28fe0769cbb620387a0e0134f01f9 


Diff: https://reviews.apache.org/r/60957/diff/1/


Testing
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make check


Thanks,

James Peach