'Gitlab deployment_tier purpose?

Hello can anybody tell me what exactly the deployment_tier for environments is for in gitlab-ci?

https://docs.gitlab.com/ee/ci/yaml/index.html#environmentdeployment_tier https://docs.gitlab.com/ee/ci/environments/index.html#deployment-tier-of-environments

Is this just like a label for the environment or does it actually has any functionality?



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