We use Sensu with the graphite plugins[1] for alerting based on graphite queries. It works quite well, but you do need to set up Sensu server – which is very straightforward in my experience<p>[1]: <a href="https:&#x2F;&#x2F;github.com&#x2F;sensu-plugins&#x2F;sensu-plugins-graphite" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;sensu-plugins&#x2F;sensu-plugins-graphite</a>