Bernard,

This is exactly what this ruleset does.
If a node down event arrives, it displays it, and if a node up event for the
same node arrives within 10 minutes, it removes both events from the workspace.

An easy way to test this is to open a dynamic workspace with this ruleset
active. You can then test to see if it does what you want.

Regards
Wouter de Bruin
Network Management Consultant
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