There is a bug in the new “macOS has been out-of-date for XX days” notification functionality in Munki 7.1 and 7.1.1. This bug can cause Munki to do an aggressive notification after seeing that macOS 26.5 is available.
If you want to avoid the aggressive notifications without having to update to Munki 7.1.2 (to give you more time to test, etc), you can do one (or more) of several things:
1) Set ManagedInstalls’ InstallAppleSoftwareUpdates to false (Munki then won’t notify about pending Apple updates at all)
2) Set ManagedInstalls’ AggressiveUpdateNotificationDays to 0 (or a very high value) (Munki won’t then do aggressive update notifications)
3) Set Apple software updates deferral of enforcedSoftwareUpdateMinorOSDeferredInstallDelay to some higher value (high enough to buy you more time)
-Greg