Monitoring with Prometheus 2.0

Posted Jan 19, 2018 8:55 UTC (Fri) by barryascott (subscriber, #80640)
Parent article: Monitoring with Prometheus 2.0

Once you have created a couple of grafana dashboards it then
becomes a short task to craft custom dashboards for any purpose.
The hard bit is what metrics do we need to show to help understand
the behaviour we are curious about.

That RRD reduces the detail of the metrics it stores over time is
a problem.

Often I want to compare a metric from this week with the one a
few weeks ago. That's often not possible with RRD once the detail
has gone.

We are hoping to be able to keep full metrics for long enough with
Prometheus. The trade off being the storage needs.

Barry

Monitoring with Prometheus 2.0

Posted Jan 19, 2018 9:53 UTC (Fri) by bangert (subscriber, #28342) [Link]

RRD only aggregates data if you tell it to - and yes, it is annoying that you have to specify that up front.

A big issue for most(all?) other tsdb's is, that they use much more storage per saved data byte compared to RRD.
This is not only a question about the amount of storage but IO performance.