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ROSAENG-1089: update DNS architecture doc for hash4 uniqueness #739

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Aug 11, 2026
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ROSAENG-1089: update DNS architecture doc for hash4 uniqueness #739

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2 changes: 1 addition & 1 deletion docs/design/dns-architecture.md
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Expand Up @@ -121,7 +121,7 @@ Zones created by HyperShift CPO in the customer account (not delegated from shar
| :---------------- | :-------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------ | :----------------- | :------------------------------------------------------------------------- |
| `deployment_name` | 1–25 characters | Subdomain for a regional deployment. Defaults to the AWS region name; suffixed when multiple deployments share a region or for per-run CI environments. | Service | `us-east-1` (len 9), `us-east-1-2` (len 12), `us-east-1-eph-a1b2` (len 19) |
| `zone_shard` | 1–3 characters | Subdomain for a regional deployment's HostedZone shard (capped at 100) | Service | `0` (len 1), `99` (len 2) |
| `hash4` | 4 characters | Slug to allow duplicate `cluster_alias` | Service | `1fb9` (len 4) |
| `hash4` | 4 characters | Unique slug per `cluster_alias` within a zone shard; derived from cluster UUID, uniqueness enforced by platform-api at creation time | Service | `1fb9` (len 4) |
| `cluster_alias` | 1–15 characters | Alias for the cluster: user-provided (`domain_prefix`) or service-generated hash | Service / Customer | `typeidhcp` (len 10), `4354c27df47cf4e` (len 15) |

All identifiers must be DNS-subdomain compatible: lowercase alphanumeric characters or `-`, starting and ending with an alphanumeric character.
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