One of my colleagues brought an issue to my attention whereby placing a Cluster server into maintenance mode was causing a flood of “Cluster resource or group offline or partially online” alerts from that clusters resource groups.
It turns out that the default maintenance mode setting for the Resource Group dependency rollup monitor is “Rollup monitor in maintenance mode as error”. This means that any objects rolling up as maintenance mode will cause the resource group monitor to go critical and generate “Cluster resource or group offline or partially online” alerts.
Changing the value to maintenance mode alleviates this issue. I’ve also has success placing the resource groups into maintenance mode before the cluster objects.