From: Martin Pitt <martin@piware.de>
Date: Fri, 21 May 2021 11:26:23 +0000 (+0200)
Subject: Add script to generate time series
X-Git-Url: https://piware.de/gitweb/?p=learn-metrics.git;a=commitdiff_plain;h=1948264b92c88ebfe5176a4d61a23f01b457009a;hp=1948264b92c88ebfe5176a4d61a23f01b457009a

Add script to generate time series

The text import format supports specifying a time stamp [1]. Use this to
generate a time series for thing_count and thing_failures.

    ./things-series  > http/metrics
    podman pod rm -f learn-metrics || true
    podman play kube learn-metrics.yaml

First non-trivial query from "indefinitely long lookback" counters: "How
many tests happened in the last 5 minutes?

    rate(thing_count{job="host-http"}[5m]) * 5 * 60

The re-scaling is because the natural unit is "1/s" and we want the unit
to be the same as the original counter.

[1] https://prometheus.io/docs/instrumenting/exposition_formats/
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