downwardAPI could be used to inject pod's information into containers.

That could be done as below,

  volumes:
    - name: stinfo
          downwardAPI:
            items:
              - path: "annotations"
                fieldRef:
                  fieldPath: metadata.annotations
              - path: "labels"
                fieldRef:
                  fieldPath: metadata.labels

Now I want to inject controllers' information into containers, how could I do that?

For example, I want to know how many replicas there is for deployment/statefulset.

Any advice?

Thx.