[Feature]: Add option to change or flip the exit codes for alert subcommand #123
Description
Describe the feature request
In the Prometheus ecosytem there sometimes are "dead man's switch" alerts that keep firing constantly.
The logic for the exit code needs to be flipped to monitor these with the plugin. Meaning, a firing alert is OK and a missing/notfiring alert needs to CRITICAL/WARNING.
Currently we can only handle the missing alert.
See also #61 (comment)