In this case you can just directly refer to the sample value of the time
series returned by your expression (since it's already percentage you
want), something like this:
description: "Filesystem at {{$labels.mountpoint}} on
{{$labels.instance}} is only {{$value}}% free."
See also
https://prometheus.io/docs/prometheus/latest/configuration/alerting_rules/#templating
For other situations you can also really run another query from the
annotation template, see
https://prometheus.io/docs/prometheus/latest/configuration/template_examples/#simple-iteration
Btw. you might want to look at node_filesystem_avail_bytes rather
than node_filesystem_free_bytes, as free bytes also includes space reserved
for the root user, but you may run into problems with other users' disk
usage before that reserved space runs full.
Btw. another thing: depending on the use case, consider looking into
predictive disk usage alerts rather than alerts with static limits:
https://www.robustperception.io/reduce-noise-from-disk-space-alerts
On Sun, May 17, 2020 at 11:21 AM Rajesh Reddy Nachireddi <
[email protected]> wrote:
> Hi,
>
> How to use the query expression as part of annotations in alert rule
>
> - alert: OutOfDiskSpace
> expr: node_filesystem_free_bytes / node_filesystem_size_bytes * 100 < 10
> for: 1m
> labels:
> severity: Critical
> annotations:
> description: "Disk has occupied the <exprsession> percentage
>
> Regards,
>
> Rajesh
>
>
>
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Julius Volz
PromLabs - promlabs.com
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