GitLab 19 release notes

GitLab 19.5
Summary of features included in 19.5
GitLab 19.4
GitLab 19.4 released with governance for GitLab MCP server tools
GitLab 19.3
GitLab 19.3 released with Flow Creator foundational agent
GitLab 19.2
GitLab 19.2 released with GitLab Duo CLI is now generally available.
GitLab 19.1
GitLab 19.1 released with secret false positive detection with GitLab Duo.
GitLab 19.0
GitLab 19.0 released with Group-level custom review instructions for GitLab Duo