dns record diff derived

{
  "input": {
    "body": {
      "zone": "example.test",
      "after": [
        {
          "ttl": 300,
          "name": "example.test",
          "type": "A",
          "value": "203.0.113.99"
        },
        {
          "ttl": 3600,
          "name": "example.test",
          "type": "MX",
          "value": "10 mx1.vendor.test"
        },
        {
          "ttl": 3600,
          "name": "status.example.test",
          "type": "CNAME",
          "value": "pages.vendor.test"
        }
      ],
      "before": [
        {
          "ttl": 3600,
          "name": "example.test",
          "type": "A",
          "value": "203.0.113.10"
        },
        {
          "ttl": 3600,
          "name": "example.test",
          "type": "MX",
          "value": "10 mx1.vendor.test"
        },
        {
          "ttl": 3600,
          "name": "example.test",
          "type": "MX",
          "value": "20 mx2.vendor.test"
        },
        {
          "ttl": 3600,
          "name": "_dmarc.example.test",
          "type": "TXT",
          "value": "v=DMARC1; p=none; rua=mailto:d@example.test"
        }
      ]
    },
    "type": "http",
    "method": "POST",
    "bodyType": "json"
  },
  "output": {
    "type": "json",
    "example": {
      "zone": "example.test",
      "limits": {
        "maxRecords": 2000,
        "maxFindings": 500,
        "maxHeaderBytes": 131072,
        "maxIncludeTree": 200,
        "spfLookupLimit": 10,
        "maxRecordLength": 4096,
        "spfVoidLookupLimit": 2
      },
      "passed": false,
      "complete": false,
      "findings": [
        {
          "code": "RECORD_VALUE_CHANGED",
          "name": "example.test",
          "type": "A",
          "detail": "example.test A changed from 203.0.113.10 to 203.0.113.99."
        },
        {
          "code": "RECORD_REMOVED_FROM_SET",
          "name": "example.test",
          "type": "MX",
          "detail": "example.test MX lost the value 20 mx2.vendor.test, and 1 other value(s) remain."
        },
        {
          "code": "RECORD_SET_REMOVED",
          "name": "_dmarc.example.test",
          "type": "TXT",
          "detail": "_dmarc.example.test no longer has any TXT record. Whatever depended on it stops resolving once caches expire."
        }
      ],
      "unchanged": false,
      "request_id": "example-request",
      "service_id": "dns_record_diff",
      "added_count": 2,
      "assumptions": [
        "A record is identified by its name, type and value together, so a value change at one name is reported as a change rather than as an unrelated removal and addition.",
        "Losing the last record of a type at a name is separated from losing one value out of several, because only the first stops something resolving.",
        "A TTL change is reported because the old TTL governs how long the old answer survives, so a TTL change made alongside a value change does not take effect until the old one expires."
      ],
      "limitations": [
        "The two snapshots supplied. Nothing resolves DNS, so what any resolver currently holds in cache is outside this.",
        "unchanged is true only when the two snapshots were identical."
      ],
      "observed_at": "2026-10-02T00:00:00.000Z",
      "not_examined": [
        "RECORD_SET_ADDED: status.example.test gained its first CNAME record, which breaks nothing that already resolved."
      ],
      "finding_count": 3,
      "removed_count": 3,
      "service_version": "1.0.0",
      "findings_by_code": {
        "RECORD_SET_REMOVED": 1,
        "RECORD_VALUE_CHANGED": 1,
        "RECORD_REMOVED_FROM_SET": 1
      },
      "removed_set_count": 1,
      "after_record_count": 3,
      "before_record_count": 4
    }
  }
}