On 26/02/2021 14:18, David Leadbeater wrote:
See
https://www.robustperception.io/using-time-series-as-alert-thresholds
On Fri, 26 Feb 2021 at 14:16, Andrew Kulikov <[email protected]
<mailto:[email protected]>> wrote:
Hi,
I have, for example, simple alert for low swap:
name: Low swap
expr: swap_used_percent > 80
for: 10m
labels:
severity: warning
annotations:
description: Swap usage is {{ $value | printf "%.2f" }}% on {{
$labels.host }}
summary: Low swap
For some hosts it's normal to use 50% of swap, for other hosts --
90% of swap. And I would like to define different thresholds for
different hosts. Can I define per-host threshold for swap usage
write alert expression like this?
expr: swap_used_percent > {{ $swap_threshold }}
Alternatively instead of comparing against a fixed threshold (which
needs periodic checks & adjustment) you can use the predict_linear
function
(https://prometheus.io/docs/prometheus/latest/querying/functions/#predict_linear)
to project how long until all swap is used based on recent usage increases.
--
Stuart Clark
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