[Request]: Improve documentation about metrics (K8s, docker container, and AWS)

[dedemorton]

Description

In the metrics reference, we spent some time improving the documentation about host metrics when the Hosts page was added, but we have not done anything to improve the metrics documentation about K8s, docker container, and AWS metrics.

The pages should follow the same style/layout as the page about Hosts metrics and provide the same level of detail:

https://docs.elastic.co/serverless/observability/kubernetes-pod-metrics
https://docs.elastic.co/serverless/observability/docker-container-metrics
https://docs.elastic.co/serverless/observability/aws-metrics

Resources

TBD

Which documentation set does this change impact?

Stateful and Serverless

Feature differences

no differences

What release is this request related to?

N/A

Collaboration model

Other (please describe below)

Point of contact.

For collaboration model, the writing team can add the content to the docs, but someone on the product and/or development team will need to provide the details.

Main contact: TBD

Stakeholders: