I am using my own desktop build of devtools_app/flutter_beta. It's not a web version.
When I need to debugger the flutter app launched by DartCode.

1. The dart extension did not print Observatory uri to console.
2. So I have to launch the web version.
3. Cut the uri part.
4. Then uri-decode it back to raw uri.
5. Paste it into my desktop devtools_app.

. This procedure is painful..

print out Observatory uri will be greatly helpful for desktop version devtools_app user.