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Event ID: 21057 Source: MicrosoftOperationsManager

Level
Description
Computer Discovery has determined that the following computers have expired. This is because there are no computer discovery rules  that match these computers. The grace period of 48 hours has expired and these machines are marked for uninstall.

COMPUTER1 COMPUTER2 ... COMPUTERN

To correct this problem please make sure that you have computer discovery rules defined for the computers mentioned here and run computer discovery after your changes are complete.
Comments
 
Check your discovery rules at MOM Admin -> Administration -> Computer -> Computer Discovery Rules.

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