[kube-prometheus-stack] Add OOMKilled alert rule

[davidspek]

Signed-off-by: DavidSpek vanderspek.david@gmail.com

What this PR does / why we need it

Revival of #228. Adds a PrometheusRule to catch pods that have been OOMKilled.

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Special notes for your reviewer

Checklist

• DCO signed
• Chart Version bumped
• Title of the PR starts with chart name (e.g. [prometheus-couchdb-exporter])

[davidspek]

Just noticed the comment at the top of the file. I'll cleanup this PR once it's merged in kubernetes-mixin.
On hold until kubernetes-monitoring/kubernetes-mixin#800 is merged.

[monotek]

helm-charts/charts/kube-prometheus-stack/templates/prometheus/rules-1.14/kubernetes-apps.yaml

Lines 2 to 4 in 87788f3

	Generated from 'kubernetes-apps' group from https://raw.githubusercontent.com/prometheus-operator/kube-prometheus/main/manifests/kubernetesControlPlane-prometheusRule.yaml
	Do not change in-place! In order to change this file first read following link:
	https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-prometheus-stack/hack

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Any further update will cause the issue/pull request to no longer be considered stale. Thank you for your contributions.

[stale]

This issue is being automatically closed due to inactivity.