> severity: '{{ .CommonLabels.severity }}'
Ah right, so this is actually a templating problem. You want to have a
default value when *expanding the template*.
I don't do much with go templating, but it looks like the "or" function is
what you want:
https://pkg.go.dev/text/template#hdr-Functions
That page is linked
from
https://prometheus.io/docs/prometheus/latest/configuration/template_reference/
Googling for "go template examples" may help, which includes
https://play.golang.org/p/Uzpwm1Wt_E
and I also found an online tester:
https://camlittle.com/go-template-validation
Try these:
severity: '{{ or .CommonLabels.severity "error" }}'
severity: '{{if .CommonLabels.severity}}{{ .CommonLabels.severity }}{{ else
}}error{{ end }}'
> When the timeseries doesn't have any labels, how does the grouping of
these alerts are handled.
You can add extra labels in your alerting rule.
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