Reliable Insights

A blog on monitoring, scale and operational Sanity

May 20, 2019

Analyse a metric by kernel version

Using PromQL you can combine metrics for analysis.

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April 1, 2019

Staleness and PromQL

How should a monitoring system deal with metrics no longer being there?

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March 25, 2019

How does a Prometheus Summary work?

We looked previously at the counter and gauge, how does the Prometheus summary work?

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March 11, 2019

Mapping iostat to the node exporter’s node_disk_* metrics

The node exporter and tools like iostat and sar use the same core data, but how do they relate to each other?

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March 4, 2019

Measuring Java garbage collection with Prometheus

GC stats are one of the many metrics that the Java/JVM client library exposes.

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February 25, 2019

Monthly reporting with Prometheus and Python

It's common to want reports from Prometheus, such as how many requests failed over an entire month.

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February 18, 2019

How much of the time is my network usage over a certain amount?

The new subquery feature in Prometheus 2.7 makes this possible in one query.

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December 17, 2018

Limiting PromQL resource usage

Prometheus has gained a number of features to limit the impact of expensive PromQL queries.

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November 26, 2018

Unit testing alerts with Prometheus

In the previous post we looked at testing rules. You can also test alerts.

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November 19, 2018

Unit testing rules with Prometheus

As of 2.5.0, promtool has a feature to allow you to test your recording rules.

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