A few releases ago the C# / VB MSBuild task began outputting diagnostic messages for the compiler server. This was done to better enable detecting cases where the server was failing, restarting due to analyzer conflicts, etc ... Effectively make binlogs significantly more actionable for compiler developers.

Unfortunately these messages are showing up under the "Analyzer Summary" node which is unexpected.

These messages all start with CompilerServer: and should be filtered away in CscTaskAnalyzer.