Hi @McMatty,
We have only deprecated the SQ Roslyn SDK because we want to provide the same level of features without having all the ceremony of creating a SonarQube plugin.
If you are using SonarQube 7.4+ and a recent version of the Scanner for MSBuild and SonarC# you will see that any Roslyn analyzer which is run during the build will have its issues automatically imported to SonarQube.
I hope it does answer your question(s).
Cheers,
Amaury