Reliable Insights

A blog on monitoring, scale and operational Sanity

March 26, 2018

Why not send graphs with alerts?

You may have noticed that notifications from the Alertmanager are text. Wouldn't it be nice if Prometheus sent graphs along?

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March 19, 2018

Alerting on crash loops with Prometheus

If your applications are restarting regularly, whether due to segfaults or OOMs, it'd be nice to know.

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March 12, 2018

New Features in Prometheus 2.2.0

Prometheus 2.2.0 is now out, following on from 2.1.0 back in January with several fixes and improvements.

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March 5, 2018

Using sample_limit to avoid overload

Worried that your application metrics might suddenly explode in cardinality? sample_limit can save you.

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February 26, 2018

Dude, where’s my exporter?

So you have just discovered Prometheus and want to try it out or use it to replace your old monitoring system but have run into a part of your stack that you cannot instrument with a client library and for which there are no officially supported exporters. What do you do?

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February 19, 2018

Common pitfalls when using the Pushgateway

Jobs of an ephemeral nature are often not around long enough to have their metrics scraped by Prometheus. In order to remedy this the Pushgateway was developed to allow for these types of jobs to push their metrics to a metrics cache in order to be scraped by Prometheus long after the original jobs have gone away. This blogpost discusses some of the common pitfalls users tend to fall into when adding the Pushgateway to their monitoring stack.

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February 12, 2018

Alerting on gauges in Prometheus 2.0

One of the major changes introduced in Prometheus 2.0 was that of staleness handling. Previously for instant vectors, Prometheus would return a point up to 5 minutes in the past which caused a number of different issues.

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February 5, 2018

What percentage of time is my service down for?

Have you ever wondered what percentage of time a given service or application spends up or down?

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January 29, 2018

Adding Basic Auth to Prometheus with Apache

Having previously discussed why the Prometheus project does not support SSL and user authentication out of the box and detailing how to add basic authentication with Nginx, we will now demonstrate how to do the same with Apache.

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January 22, 2018

New Features in Prometheus 2.1.0

Prometheus 2.1.0 is now out, following on from 2.0.0 last month with several fixes and improvements.

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