I was curious if there was a better option than unmanaging a node or application to stop alerts during maintenance. Unmanaging seems to work fine, but when it goes back to managed it sends out alerts that say the application is in an unknown state. I realize the "unknown" state was not part of the out of the box application alert but we have had several servers that would loose their remote RPC/WMI ability on reboot and give an unknown status. We wanted to know this so we could go and reboot them again; which almost always solves the issue.
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