[stable/grafana] add namespace metadata

[lwolf]

What this PR does / why we need it:

this is needed for when helm is used purely as a templating tool,
since helm template does not add the namespace
helm/helm#3553

Signed-off-by: Sergey Nuzhdin ipaq.lw@gmail.com

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• DCO signed
• Chart Version bumped
• Title of the PR starts with chart name (e.g. [stable/chart])

[k8s-ci-robot]

Hi @lwolf. Thanks for your PR.

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[maorfr]

I would love to understand your use case

[lwolf]

As I mentioned in the original PR description this change is needed when helm is used purely as templating engine.
Usecase: all charts are rendered individually using helm template --namespace=namespace and added to the VCS, GitOps system applies entire cluster state and keeps it in sync.

Similar issues/usecases/discussions:

• helm template --namespace should set the 'metadata.namespace' field on created resources helm#3553
• Refine Helm Charts: Add missing namespaces. istio/istio#4606
• Bake manifest (Helm2) doesn't generate manifests with the namespace you provided for subcharts spinnaker/spinnaker#2909 (comment)
• [stable/mysql] add namespace metadata #13924
• [stable/rabbitmq-ha] add namespace metadata #13956

[maorfr]

/assign
/ok-to-test
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lwolf, maorfr

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[farvour]

This breaks with helmfile and the dashboards key is being used/defined.

  Error: render error in "grafana/templates/deployment.yaml": template: grafana/templates/deployment.yaml:33:44: executing "grafana/templates/deployment.yaml" at <include (print $.Tem...>: error calling include: template: grafana/templates/dashboards-json-configmap.yaml:9:24: executing "grafana/templates/dashboards-json-configmap.yaml" at <.Release.Namespace>: can't evaluate field Namespace in type interface {}
  Error: plugin "diff" exited with error```

[lwolf]

this should be fixed in #14425