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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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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September 10, 2018

Using the textfile collector from a shell script

The textfile collector is handy for monitoring machine-level cronjobs. How would you go about that?

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May 21, 2018

New Features in Node Exporter 0.16.0

Node exporter 0.16.0 is out, and with some big changes. Let's take a look.

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April 26, 2016

Using group_left to calculate label proportions

When you've broken a metric out into labels a common need is to tell what proportion each label represents of the total. The group_left modifier of Prometheus is the key.

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December 30, 2015

Understanding Machine CPU usage

High CPU load is a common cause of issues. Let's look at how to dig into it with Prometheus and the Node exporter.

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November 23, 2015

Monitoring directory sizes with the Textfile Collector

The node exporter includes many metrics out of the box, it can't possibly cover all use cases though. That's where the textfile collector comes in, allowing you to extend machine instrumentation for your use case.

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October 30, 2015

How to have labels for machine roles

It's a best practice with Prometheus that target labels should be constant over a target's entire lifetime. On the other hand it's useful to aggregate metrics across all the machines that are currently Apache servers. How can we do that?

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September 8, 2015

Machine Monitoring with Prometheus Debs

CPU, RAM, disk and network usage are basic machine metrics you should be monitoring. This is easy with Prometheus and the later releases of Debian.

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August 8, 2015

Quick Sensor Metrics with the Textfile Collector

Sometimes you need a machine metric that's not exported yet by the node exporter. The textfile collector can be used to quickly get such metrics graphed in Prometheus.

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