The Go SDK now sets the service.version resource attribute automatically when the RELEASE_ID environment variable is present, removing the need to wire it manually on Vercel, Fly, Railway, and Render.

Manual configuration still works and takes precedence when both are set — we only fill in the attribute when it is otherwise missing. Existing code keeps working; nothing to change on upgrade.

The Go SDK setup guide now leads with the environment-variable flow and keeps the manual block below it for platforms without a built-in release id.