alertmanager: attempt to deploy rancher-monitoring with an helm chart

Closed Guillaume Samson requested to merge rancher_monitoring into production

(MR for the record to track this attempt.)

  1. CRDs had to be installed before chart (use crds directory) Helm doesn't managed order between the charts and their dependencies.
  2. Application namespaces need to be overriden or explicitly declared on helm command line arguments to activate the monitoring application in Rancher. So this won't run in ArgoCD.

Related to swh/infra/sysadm-environment#5018 (closed)

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