We need to make sure that we have consistent way of aligning common ECS fields across integrations reporting same resource information. An example can be container.image.name and kubernetes.container.image (added at #20984) which is actually the same field but it not aliased like what is happening with Docker:

docker.container.image
type: alias
alias to: container.image.name

Update:
Verify that state_* metricsets follow ECS. For instance testing state_container datastream of k8s package I get:

kubernetes/state_container default:
[0] field "container.runtime" is undefined
[1] field "kubernetes.container.image" is undefined
[2] field "kubernetes.container.name" is undefined
[3] field "kubernetes.namespace" is undefined
[4] field "kubernetes.node.name" is undefined
[5] field "kubernetes.pod.name" is undefined

So kubernetes.container.* seem to need to be changed.