Reliable Insights

A blog on monitoring, scale and operational Sanity

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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November 18, 2019

Evaluating Performance and Correctness

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

September 30, 2019

How does a Prometheus Histogram work?

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

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September 9, 2019

What queries were running when Prometheus died?

As of Prometheus 2.12.0 there's a new feature to help find problematic queries.

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August 12, 2019

What range should I use with rate()?

Choosing what range to use with the rate function can be a bit subtle.

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July 29, 2019

Step and query_range

Graphs from Prometheus use the query_range endpoint, and there's a non-trivial amount of confusion that it's more magic than it actually is.

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July 22, 2019

How should pipelines be monitored?

For online serving systems it's fairly well known that you should look for request rate, errors and duration. What about offline processing pipelines though?

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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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