This is the only monitoring tool that provides realtime per second monitoring of our infrastructure.. We have reduced our outages and helps in quick troubleshooting.

Netdata is a low maintenance, low effort way to start monitoring some deep system metrics and it "just works". Netdata's free tier gives you the chance to see all the product features. Digging into different metrics and grouping by different dimensions is extremely useful. Correlating metrics is fairly easy and is done better than most other tools I've used. If you know the metrics that matter on a system, it seems relatively easy to look at those metrics across systems. Documentation is reasonably good. Most of the metrics and alerts have useful help pages describing what a metric is and why it matters.

It just works, out of the box it will give you more metrics that you have ever dreamed of AND give you sensible alerts for those metrics.