Reliable Insights

A blog on monitoring, scale and operational Sanity

January 20, 2020

Graphite’s summarize and smartSummarize in PromQL

How do you convert summarizeinto PromQL?

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January 13, 2020

Optimising index memory usage for blocks

One of the big changes in Prometheus 2.15.0 was reduced memory usage for indexes.

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January 6, 2020

Network interface metrics from the node exporter

Along with many others, the node exporter exposes network interface metrics.

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December 30, 2019

Left joins in PromQL

Just because SQL isn't in the name doesn't mean that you can't do SQL-like joins with PromQL.

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December 23, 2019

New Features in Prometheus 2.15.0

Prometheus 2.15.0 is now out, following on from 2.14.0 with many fixes and improvements.

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December 16, 2019

CC and BCC in Alertmanager emails

If you look at the documentation, the Alertmanager has a to field, but nothing for CC or BCC. So how do you do those?

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December 9, 2019

PromQL Subqueries and Alignment

Subqueries were added to PromQL a while back, but there's more to this feature than it'd seem.

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December 2, 2019

Target labels, not metric name prefixes

Services are not distinguished by their metric names in Prometheus.

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November 25, 2019

Filesystem metrics from the node exporter

The node exporter exposes filesystem metrics out of the box, so let's take a look.

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November 18, 2019

Evaluating Performance and Correctness

There's more to selecting a piece of software than headline numbers. Read more


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