Check manual page of apc_ats_status
APC ATS: Status
Checks the status of a APC Automatic Transfer Switch.
This means it throws CRIT if:
The power source has changed since last inventory,
the communication status gets lost,
the redundancy is lost,
the current ouput power exceeded the maximum limit for swiching to the alternate power source
or the 5V or 24V supply fails
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