Project: mesos
Issue MESOS-2080: Add master metrics for maintenance.
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.
Story points: 3