Prometheus

What do you like best?

The Best thing I liked about Prometheus is that It comes with it's own Prom Query Language. Once we learn Prom Query Language, we can write any query to define alerting rules. Also it comes with many aggregate functions which can be used to filter and apply mathematical calculations on the alerts. It comes with wide variety of alerting metrics. Example for Virtual machines and also for Kubernetes Clusters.

What do you dislike?

There is very minimum things to said as bad, but one thing that i found is you will have to know all the metric names in order to create rules and there are a lot of metrics. Also another thing which i disliked is it doesn't have a stable client library for most of the programming languages.

Recommendations to others considering the product:

If you want a monitoring system which is open source then Prometheus is the best choice for you. As it is open source, there is plenty of room for new features. It can incorporate with many alerting systems, which is a plus.

What problems are you solving with the product? What benefits have you realized?

I am using Prometheus to monitor Kubernetes clusters and virtual machines and create alerts based of different situations. The most important benefit i have realized is it supports both webhook and email alerts.