Project: mesos
Issue MESOS-2077: Ensure that TASK_LOSTs for a hard slave drain (SIGUSR1) include a Reason.
For maintenance, sometimes operators will force the drain of a slave (via SIGUSR1), when deemed safe (e.g. non-critical tasks running) and/or necessary (e.g. bad hardware). To eliminate alerting noise, we'd like to add a 'Reason' that expresses the forced drain of the slave, so that these are not considered to be a generic slave removal TASK_LOST.
Story points: 3