Kubernetes visualisation fixed filters

We want to start the implementation of the Environments page (design here) by supported a predefined, fixed set of labels.

A later approach might be a kind: Environment or something else TBD.

Prior art

The deprecated Deploy boards worked out of the following annotations(?):

• app.gitlab.com/env: $CI_ENVIRONMENT_SLUG
• app.gitlab.com/app: $CI_PROJECT_PATH_SLUG

The Kubernetes documentation includes a list of recommended labels.

Proposal

We consider a Kubernetes resource associated with a GitLab environment if

1. they are in the Kubernetes namespace associated with the GitLab environment
2. and have the labels
   • app.gitlab.com/environment_slug: The environment slug
   • app.gitlab.com/project_id: The project ID of the environment

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