Similar issue as with nut per bug# 12921 Purely a convenience for those using apcupsd add-on for their UPS -cab
Patch to fix this has been submitted to the dev mailing list and patchwork. https://lists.ipfire.org/pipermail/development/2023-February/015496.html https://patchwork.ipfire.org/project/ipfire/patch/20230221135517.6286-1-adolf.belka@ipfire.org/
https://git.ipfire.org/?p=ipfire-2.x.git;a=commit;h=284ebca0577fe41ee914e70c72865794be705c01
https://blog.ipfire.org/post/ipfire-2-27-core-update-174-is-available-for-testing
I have tested CU174 Testing out on my vm testbed and can confirm that APCUPS is now shown as one of the sections in the drop down box for the system logs. This verifies this bug fix.
https://blog.ipfire.org/post/ipfire-2-27-core-update-174-released