Prometheus alerts use the same powerful PromQL expressions as queries and graphs. This can be used to produce sophisticated alerts.
Reliable Insights
A blog on monitoring, scale and operational Sanity
Prometheus doesn't have an explicit boolean type or functionality. However there is a convention and enough power in PromQL to work with booleans.
A handy feature of the Alertmanager is that almost all notification fields are templatable. This can be used to route emails based on labels.
One of the advantages of pull-based monitoring such as Prometheus is that you can tell if the target is healthy as part of the scrape. How do you do that though?
Prometheus offers integrations with systems like PagerDuty, Email and Hipchat for alert notifications - but what if you want do something that's not supported out of the box? The Alertmanager's generic web hook has got you covered.
The most common way to learn about the expiry date of your website's SSL certificate is after it has expired. The blackbox exporter combined with Prometheus can let you know well in advance, letting you renew your certificate before users complain.
Knowing which instances of your services and which machines in your fleet are no longer responding is a common requirement. Whether it's to get someone to investigate or to drive automation, in this post I'll look at how you can do it with Prometheus.
How often have you gotten alerted about disk space going over some threshold, only to discover it'll be weeks or even months until the disk actually fills? Noisy alerts are bad alerts. The new predict_linear() function in Prometheus gives you a way to have a smarter, more useful alert.
