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2.5. Threshold and ranges

A range is defined as a start and end point (inclusive) on a numeric scale (possibly negative or positive infinity).

A threshold is a range with an alert level (either warning or critical). Use the set_thresholds(thresholds *, char *, char *) function to set the thresholds.

The theory is that the plugin will do some sort of check which returns back a numerical value, or metric, which is then compared to the warning and critical thresholds. Use the get_status(double, thresholds *) function to compare the value against the thresholds.

This is the generalised format for ranges:

[@]start:end
Notes:

start ? end

start and ":" is not required if start=0

if range is of format "start:" and end is not specified, assume end is infinity

to specify negative infinity, use "~"

alert is raised if metric is outside start and end range (inclusive of endpoints)

if range starts with "@", then alert if inside this range (inclusive of endpoints)

Note: Not all plugins are coded to expect ranges in this format yet. There will be some work in providing multiple metrics.