Werk #17281: Skip creation of invalid metric

Component	Checks & agents
Title	Skip creation of invalid metric
Date	Feb 13, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.4.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.3.0p27 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

When a user without an ID was present in the monitoring the check_notify_count active check would be able to create an invalid metric called _num.

Now this is no longer possible and the metric is just being skipped.

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