On Saturday, 4 April 2020 10:43:27 UTC+1, Belmark Caday wrote:
>
> Here are the udpdated tests :
>
> - series: 'node_filesystem_free{fstype="ext4"}'
> values: '1+0x120'
>
> - expr: 'predict_linear(node_filesystem_free{fstype!~"tmpfs"}[1h], 4 *
> 3600) > 0'
>
> eval_time: 1m
>
>
> exp_samples:
>
>
> - labels: 'node_filesystem_free{fstype="ext4"}'
>
>
> value: 1
>
> And here is the error message I get:
>
> FAILED:
> expr: "predict_linear(node_filesystem_free{fstype!~\"tmpfs\"}[1h], 4 *
> 3600) > 0", time: 1m0s,
> exp:"{__name__=\"node_filesystem_free\", fstype=\"ext4\"} 1E+00"
> got:"{fstype=\"ext4\"} 1E+00"
>
>
Good: the error message tells you exactly what the problem is. You said
the expected result is
node_filesystem_free{fstype="ext4"} 1
but the actual result was
{fstype="ext4"} 1
That is correct: the output of the predict_linear() function is a
timeseries with no metric name.
If you go to the prometheus GUI (normally on port 9090) and try these two
promQL expressions, you'll see the difference:
node_filesystem_free_bytes{fstype!~"tmpfs"}
predict_linear(node_filesystem_free_bytes{fstype!~"tmpfs"}[1h], 4 * 3600)
HTH,
Brian.
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