Reliable Insights

A blog on monitoring, scale and operational Sanity

September 14, 2020

New Features in Prometheus 2.21.0

Prometheus 2.21.0 is now out, following on from 2.20.0 with many fixes and improvements.

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September 7, 2020

Why does Prometheus use so much RAM?

Users are sometimes surprised that Prometheus uses RAM, let's look at that.

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August 31, 2020

CPU scheduling metrics from the node exporter

Linux provides scheduling metrics in /proc/schedstat, which the node exporter uses.

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August 24, 2020

Failing a scrape with the Prometheus Go client

As previously mentioned partial failure is hard to deal with.

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August 17, 2020

CPU frequency scaling metrics from the node exporter

Modern CPUs don't run at one constant frequency.

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August 10, 2020

Using the group() aggregator in PromQL

Prometheus 2.20 added a group aggregator. What is it for?

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August 3, 2020

Linux software RAID metrics from the node exporter

/proc/mdstat is another of the files that the node exporter exposes as metrics.

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July 27, 2020

New Features in Prometheus 2.20.0

Prometheus 2.20.0 is now out, following on from 2.19.0 with many fixes and improvements.

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July 20, 2020

Delete All Your Alerts

Trying to improve alerting piecemeal can be difficult.

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July 13, 2020

Time metric from the node exporter

The node exporter exposes the current machine time.

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