mon(8) on Linux
The text c9e4631dd6ac, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster) shipped it.
monitor services for availability, sending alarms upon failures.
Flags it lists
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-A -
-B -
-D -
-L -
-M -
-P -
-S -
-a -
-b -
-c -
-d -
-f -
-h -
-i -
-k -
-l -
-m -
-p -
-r -
-s -
-v