Hysteresis anyone?

[Matthias Flacke]

Maybe a check_multi solution is something for you
(http://my-plugin.de/check_multi):

----- 8< ------------------------------------------------------
# hysteresis.cmd
# call: check_multi -f hysteresis.cmd \
#    -s LASTSERVICESTATEID=$LASTSERVICESTATEID$ \
#    -s UPPER=<upper threshold> -s LOWER=<lower threshold>
#
# 1. get temperature value
command [ temperature ] = check_snmp ...

# 2. evaluate states
state [ CRITICAL ] = \
          $temperature$ >= $UPPER$ || \
        ( $temperature$ >= $LOWER$ && $LASTSERVICESTATEID$ != OK )
----- 8< ------------------------------------------------------

Didn't tested it, but it should work that way ;-)

The trick is the state evaluation which allows arbitrary perl expressions.
Nagios macros or extra parameters can be passed via -s/--set.

HTH - Matthias

Simon Kainz wrote:
> I'm currently monitoring several room temperature and humidity meters
> and was wondering if anyone already has implementet some kind of
> hysteresis in Nagios ?
> 
> My scenario is the following: I want an critical state when temp rises
> above 26 degrees. As long as it doesnt drop below, say 24 deg, the state
> should stay critial. The temp usually floats around 26 degrees (my upper
> bound) which would lead to lots of notifications. But i only want the ok
> notification after the temp drops below my lower bound (24 deg).
> Everything inbetween shoud not trigger any warnings.
> 
> 
> I've arguing to implement this behaviour directly in my temp check
> plugins but was wondering if there is another more general approach to
> this. Maybe some event handler magic ?
> 
> 
> Hope i got this clear...
> 
> 
> TIA, Simon

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