This should be the communication between agent and its parent.
Agents receives stuff from parent, link config or check requests.
Agents sends stuff to parent, like check results.
If you look at the parent or the master there are similar messages there about receiving check results and so on.
If it’s an issue, I believe you can adjust the logging level (I don’t have a Windows server to test with). Maybe there’s a way to more finely tune the logging filter (e.g. WorkQueue) or it could be added? Event Log filtering has improved a lot so I’d imagine it can help you as well.
I edit this file
c:\ProgramData\icinga2\etc\icinga2\features-available\windowseventlog.conf
and change
severity = “information” —> severity = “warning”