ROSAENG-1089: update DNS architecture doc for hash4 uniqueness

[typeid]

Summary

• Update hash4 description in the Domain Name Identifiers table to reflect that uniqueness is enforced by the platform-api at creation time

Companion to openshift-online/rosa-hyperfleet-api#308.

Test plan

• Doc-only change, no code impact

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Clarified that the hash4 identifier is derived from the cluster UUID.
  • Documented that uniqueness is enforced during cluster creation.

[openshift-ci-robot]

@typeid: This pull request references ROSAENG-1089 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the sub-task to target the "5.0.0" version, but no target version was set.

Details

In response to this:

Summary

• Update hash4 description in the Domain Name Identifiers table to reflect that uniqueness is enforced by the platform-api at creation time

Companion to openshift-online/rosa-hyperfleet-api#308.

Test plan

• Doc-only change, no code impact

🤖 Generated with Claude Code

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between c84ca0d and 16480fa.

📒 Files selected for processing (1)

• docs/design/dns-architecture.md

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📝 Walkthrough

Walkthrough

The DNS architecture documentation now states that hash4 derives from the cluster UUID and that platform-api enforces uniqueness during cluster creation.

Changes

DNS architecture documentation

Layer / File(s)	Summary
Clarify hash4 generation and uniqueness docs/design/dns-architecture.md	The hash4 description now specifies UUID-derived generation and uniqueness enforcement by platform-api during cluster creation.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the documentation update to clarify hash4 uniqueness.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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