Nagios plugin exit statuses. Ordered by priority - OK < Warning < Critical < Unknown, which correspond to plugin exit statuses of 0, 1, 2, and 3 respectively.

A CheckResult is the exit status of the plugin combined with the plugin's info text. A NagiosPlugin which exits with

CheckResult (Critical "entropy decreasing in closed system")

as its peak-badness CheckResult (and no PerfDatums) will a) exit with status 2 and b) output the text "CRITICAL: entropy decreasing in closed system".

Execute a Nagios check. The program will terminate at the check's completion. A default status will provided if none is given.

Execute a Nagios check as with runNagiosPlugin, but return its final state rather than terminating.

Insert a performance metric into the list the check will output.

Alternative mechanism for adding perfdata generated from complex types; just implement the toPerfData typeclass.

Convenience function to insert a perfdatum without thresholds for min, max, warn or crit. Note that unless the range of the metric is actually unbounded, specifying explicit thresholds is considered good practice (it makes life easier for authors of graphing packages).

FIXME: implement thresholds properly and default to negative and positive infinity for min and max here.

Insert a result. Only the CheckStatus with the most badness will determine the check's exit status.

Extract the return status from a CheckResult.

Extract the infotext from a CheckResult.

Returns result with greatest badness, or a default UNKNOWN result if no results have been specified.

Given a check's final state, return the status and output it would exit with.

A Nagios "unit of measure". NoUOM translates to an empty string in the check output; it is idiomatic to use it liberally whenever the standard units do not fit.

Value of a performance metric.

One performance metric. A plugin will output zero or more of these, whereupon Nagios generally passes them off to an external system such as RRDTool or Vaultaire. The thresholds are purely informative (designed to be graphed), and do not affect alerting; likewise with _min and _max.

Create a PerfDatum from only the required values, using Nothing for all the others.