This monitorinh plugin queries prtAlertTable from the Printer MIB.

It honors only prtAlertTrainingLevel = trained(4) or
fieldService(5),prtAlertTrainingLevel = other(1),unknown(2),untrained(3) and
management(6) are ignored.

For prtAlertSeverityLevel = warning(4) the plugin result is "WARNING", for
critical(3) the plugin result is "CRITICAL", obviously, for
warningBinaryChangeEvent(5) (new in RFC3805) the state is by default "WARNING",
but there is a hardcoded table of change events, which result in state
"CRITICAL".