add starting point for discussing DNS reservations

[deads2k]

Things to create soon

1. etag based replaces depends on align the cosmosdata and cosmosmetadata interfaces #3878
2. cluster watcher for updates possible to start now, but will priortize etags
3. controller that cleans up orphaned dnsreservations

Things to complete in this PR

1. making it easy to build the nested resourceIDs

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deads2k

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• backend/OWNERS [deads2k]
• internal/OWNERS [deads2k]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[openshift-ci]

@deads2k: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/integration	6208790	link	true	/test integration
ci/prow/lint	6208790	link	true	/test lint
ci/prow/images	6208790	link	true	/test images
ci/prow/e2e-parallel	6208790	link	true	/test e2e-parallel
ci/prow/verify	6208790	link	true	/test verify
ci/prow/test-unit	6208790	link	true	/test test-unit

Full PR test history. Your PR dashboard.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.