Reliable Insights

A blog on monitoring, scale and operational Sanity

April 8, 2019

Configuring Prometheus storage retention

How can you control how much history Prometheus keeps?

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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 18, 2019

New Features in Prometheus 2.8.0

Prometheus 2.8.0 is now out, following on from 2.7.0 with many fixes and improvements.

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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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February 11, 2019

“INVALID” is not a valid start token and other scrape errors

What can you do to pin down metrics-parsing related scrape errors in Prometheus?

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February 4, 2019

Using tsdb analyze to investigate churn and cardinality

The Prometheus TSDB's code base includes a tool to help you find "interesting" metrics in terms of storage performance.

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