A guide to the breaking changes in GitLab 19.0

This post details breaking changes in GitLab 19.0 impacting self-managed deployments. It announces the transition from NGINX Ingress to Gateway API with Envoy Gateway as the default networking component, and the removal of bundled PostgreSQL, Redis, and MinIO from the Helm chart. It also mandates PostgreSQL 17 as the minimum version, dropping support for PostgreSQL 16. Support for Ubuntu 20.04 and Redis 6 is discontinued, and the `heroku/builder:24` image replaces `heroku/builder:22` in Auto DevOps. Bundled Mattermost and support for SUSE distributions are removed from the Linux package. Mitigation steps and migration guides are provided for each change.