Reliable Insights

A blog on monitoring, scale and operational Sanity

October 29, 2018

How many metrics should an application return?

While each application is different, a rough idea of how many metric there should be would be useful.

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October 22, 2018

Debugging Blackbox exporter failures

Ever wanted more information about Blackbox probe failures?

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October 15, 2018

Graph top N time series in Grafana

As of Grafana 5.3.0 there's a feature that allows correct graphing of the top N series over a duration.

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October 8, 2018

Checking for HTTP 200s with the Blackbox Exporter

It's easy to check if HTTP and HTTPS endpoints are working with the Blackbox Exporter.

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October 1, 2018

What is a job label for?

The job label is one of the labels your targets will always have. So how can you use it?

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September 24, 2018

Alerting on approaching open file limits

In a previous post we looked at dealing with reaching the open file limit. How about alerting before it happens?

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September 17, 2018

New Features in Prometheus 2.4.0

Prometheus 2.4.0 is now out, following on from 2.3.0 back in June with many fixes and improvements.

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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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September 3, 2018

Deleting time series from Prometheus

If a misconfiguration leads to unwanted time series, it'd good to know how to remove them.

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August 27, 2018

Dealing with “too many open files”

While not a problem specific to Prometheus, being affected by the open files ulimit is something you're likely to run into at some point.

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