Some handy scripts we've written for Nagios, at Etsy:
check_graphite_data:
Alert on data, based on number from Graphite.
Usage:
check_graphite_data <options>
Options:
-c <num> --crit=<num> Critical threshold
-w <num> --warn=<num> Warning threshold
-u <url> --url=<url> Graphite graph URL
-r Reverse - Alert when the value is UNDER warn/crit instead of OVER
-s <secs> --seconds=<secs> Average over the last N seconds of data
--d1 <url> --d2 <url> Diff the latest values between two graphs
-W --holt-winters Perform a Holt-Winters check
-U --critupper Upper Holt-Winters band breach causes a crit,
- breaching lower band causes a warn
-L --critlower Lower Holt-Winters band breach causes a crit,
- breaching upper band causes a warn
(If neither -U nor -L are given, we will always warn)