MMS Alert for Balancer Down status
please provide an option in Ops Manager to monitor the balancer status and add to alerts?
So, we will know if balancer is not running.
Normally the balancer would be disabled during backups and during a scheduled Balancing Window downtime.
I believe that the Balancer has a duty cycle of either 10 secs when nothing recently to balance, or 1 sec when there's a bunch of balancing to do.
Any alert would need to account for these:
the changelog shows chunk moves commanded
the actionlog shows balancer state change history
the settings collection has the balancer state
Diego Rodriguez commented
A Per Project Alert that triggers whenever the Balancer has been disabled for a specified period of time would be great to have. It will help preventing situations where the Balancer is inadvertently left disabled, leading to chunk imbalance on Sharded Clusters.