Microsoft.Network/privateDnsZones etag should be marked readOnly

[ms-henglu]

Service: Private DNS
Resource type: Microsoft.Network/privateDnsZones (definition: PrivateZone)
API versions: 2024-06-01 (also 2020-06-01)

Problem
etag is server-generated and used via If-Match/If-None-Match headers for concurrency. In swagger it is not marked readOnly, which can mislead clients and SDKs into treating it as writable.

Evidence
File: specification/privatedns/resource-manager/Microsoft.Network/stable/2024-06-01/privatedns.json
Path: definitions.PrivateZone.properties.etag
Current:
"etag": {
"type": "string",
"description": "The ETag of the zone."
}
Expected:
"etag": {
"type": "string",
"description": "The ETag of the zone.",
"readOnly": true
}

Related
For consistency, apply the same to:

• definitions.VirtualNetworkLink.properties.etag
• definitions.RecordSet.properties.etag

Proposal

• Mark etag as readOnly for PrivateZone, VirtualNetworkLink, and RecordSet across affected API versions.
• Optionally reflect in TypeSpec (add read-only visibility for etag).