Change log for GCP_DNS

Date Changes
2026-06-02 principal.hostname: Newly mapped jsonPayload.vmInstanceName raw log field with principal.hostname UDM field.
2026-03-17 Improved the grok pattern to extract the correct values from the jsonPayload.queryName raw log fields and mapped them to the network.dns.questions.name UDM field.
2025-07-01 principal.namespace: Removed mapping of jsonPayload.sourceNetwork from principal.namespace UDM field and mapped additional.fields in order to prevent the feed namespace from being overwritten by the prebuilt parser.
2024-12-16 Promoted GCP_DNS parser to default.