[jira] [Created] (MESOS-2080) Add master metrics for maintenance.

["Benjamin Mahler (JIRA)" <ji...@apache.org>]

Benjamin Mahler created MESOS-2080:
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             Summary: Add master metrics for maintenance.
                 Key: MESOS-2080
                 URL: https://issues.apache.org/jira/browse/MESOS-2080
             Project: Mesos
          Issue Type: Task
          Components: master
            Reporter: Benjamin Mahler


We'll need metrics in order to gain visibility into the maintenance functionality. This will also allow operators to add alerting on these metrics, in particular:

# Number of scheduled hosts.
# Number of active windows.
# Number of expired windows.
# Number of successful drains.
# Number of failed drains.

As an example of an alert guideline, we would want to know the number of expired windows as a gauge to ensure that it is not growing excessively. This allows alerting to catch when operators are not properly unscheduling maintenance once it is complete.



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