Acknowledgement from nonexistent Contact causes error

[martialblog]

Hi,

I noticed the following:

I have an Event Rule with a simple Service filter and no condition and a Contact "Foo" as recipient.

When I acknowledge this Icinga2 Service in Icinga2 as user "admin" the "Foo" recipient is not notified (don't know if this is expected behavior or not?).

The daemon still throws both a Warning and an Error. A single Warning is probably maybe what I expect:

2024-07-25T09:54:57.553Z	INFO	incident	Muting incident	{"object": "icinga.vagrant!SomeURL", "incident": "#19", "event": "[time=2024-07-25 09:54:57.55160773 +0000 UTC m=+2705.366211443 type=\"acknowledgement-set\" severity=]", "reason": "Checkable acknowledged by \"admin\": ACK ACK ACK"}
2024-07-25T09:54:57.554Z	WARN	incident	Ignoring acknowledgement event from an unknown author	{"object": "icinga.vagrant!SomeURL", "incident": "#19", "author": "admin"}
2024-07-25T09:54:57.554Z	ERROR	icinga2	Cannot process event	{"source_id": 1, "event": "[time=2024-07-25 09:54:57.55160773 +0000 UTC m=+2705.366211443 type=\"acknowledgement-set\" severity=]", "error": "unknown acknowledgment author \"admin\""}