Regex for alerting rules expressions

[BlueChips23]

Hi,

I have a Prometheus alerting rule like this:

alert: wrong_number_of_pods
expr: kube_deployment_status_replicas_available{namespace="abc"} != 2
for: 3m
annotations:
  description: 'Deployment: {{ $labels.deployment }} has wrong number of pods running.'
  summary: 'Deployment: {{ $labels.deployment }} has wrong number of pods running.'

I'm trying to apply this rule to two namespaces - "abc" and "def-xyz". Note that the second namespace has a hyphen in it's name.

I'm wondering if it is possible to use regex to specify both the namespaces - may be something like this: expr: kube_deployment_status_replicas_available{namespace="abc"|"def-xyz"} (although this exact expr doesn't work).

The alternate approach is to include the two namespaces in relabel-configs. Right now, my relabel-config looks like this:

- source_labels: [__meta_kubernetes_namespace] regex: abc action: keep

How should I change the regex above to include both "abc" and "def-xyz"? Is it like this?

- source_labels: [__meta_kubernetes_namespace] regex: abc | def-xyz action: keep

Thanks.

[Christian Hoffmann]

On 8/9/18 10:42 PM, BlueChips23 wrote:
> I'm wondering if it is possible to use regex to specify both the

> namespaces - may be something like this: *expr:
> kube_deployment_status_replicas_available{namespace="abc"|"def-xyz"}* (although

> this exact expr doesn't work).

Sounds like this should do the trick?

kube_deployment_status_replicas_available{namespace=~"abc|def-xyz"}

Or do you mean some kind of range with the hyphen? If so, can you be
more concrete?

Kind regards,
Christian

[Matt Doughty]

kube_deployment_status_replicas_available{namespace=~"(abc|xyz)"} should do what you want.

--Matt

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--Matt

[l.mi...@gmail.com]

kube_deployment_status_replicas_available{namespace=~"(abc|def-xyz)"}

unless I'm missing something above is the query you want. Regex syntax is explained on https://prometheus.io/docs/prometheus/latest/querying/basics/

[BlueChips23]

kube_deployment_status_replicas_available{namespace=~"abc|def-xyz"} 

Gotcha. I was doing it wrong. I was trying kube_deployment_status_replicas_available{namespace="abc|def-xyz"}  without the ~. Thank you!

[Meier]

You could also do it much more generic:

expr: (kube_deployment_status_replicas_unavailable > 0) or (kube_deployment_status_replicas != kube_deployment_status_replicas_available) or (kube_deployment_status_replicas unless kube_deployment_status_replicas_available)