Hello,
I currentently experience:
root@quarterberry:~# /usr/lib/nagios/plugins/check_apt
APT OK: 0 packages available for upgrade (0 critical updates). |available_upgrades=0;;;0 critical_updates=0;;;0
root@quarterberry:~# apt list --upgradable
linux-image-arm64/stable-security 6.12.86-1 arm64 [upgradable from: 6.12.85-1]
Notice: There are 2 additional versions. Please use the '-a' switch to see them.
and so icinga doesn't notify me about the pending upgrade.
I would expect that check_apt detects that as a critical update.
Best regards
Uwe