Automated Backups of Etcd

[hasbro17]

This PR resurrects the proposal for automated backups of etcd from #1370

Given that the actual API and implementation PRs have already been merged for this feature, this proposal is more descriptive than prescriptive. While the original proposal had more what-ifs and open ended questions more relevant to the initial design phase, this proposal documents the changes we made as the API and implementation details have evolved since then.

The only piece that's left for a follow up is the no-opinion Backup config that would save and spread backups across all nodes with a default retention policy.

/cc @tjungblu @dusk125

[openshift-merge-robot]

@hasbro17: The following test 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/markdownlint	ed885e1	link	true	/test markdownlint

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[tjungblu]

lgtm and approved :)
Thanks @hasbro17.

[hasbro17]

Forgot this was still hanging around.

Linting: 569 file(s)
Summary: 1 error(s)
enhancements/etcd/automated-backups.md:158:401 MD013/line-length Line length [Expected: 400; Actual: 864]

That's due to the rather long regex on the cron format which is unavoidable. Going to try and override the linter job since there seem to be no other issues.

/override ci/prow/markdownlint

[openshift-ci]

@hasbro17: Overrode contexts on behalf of hasbro17: ci/prow/markdownlint

In response to this:

Forgot this was still hanging around.

Linting: 569 file(s)
Summary: 1 error(s)
enhancements/etcd/automated-backups.md:158:401 MD013/line-length Line length [Expected: 400; Actual: 864]

That's due to the rather long regex on the cron format which is unavoidable. Going to try and override the linter job since there seem to be no other issues.

/override ci/prow/markdownlint

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/test-infra repository.

[openshift-ci]

@hasbro17: all tests passed!

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[hasbro17]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hasbro17

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[tjungblu]

/lgtm