Werk #14395: allow custom notification events for pagerduty testing

Component	Notifications
Title	allow custom notification events for pagerduty testing
Date	Jun 10, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

To test pagerduty notification you can now use CUSTOM commands as documented.

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