How to: Labels, selectors and annotations
Labels are used for groupings, filtering and providing metadata. Selectors are used to group related resources. Annotations are used to provide additional metadata but are not used in queries. \
When a deployment is created, a default Label `app=$appName` is assigned, and a similar Selector is also created. When a pod is created, a default Label `run=$podName` is assigned

> Labels added after creating a deployment are not inherited by the resources

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