The Build Warnings widgets shows the number of build warnings produced for a specific build. This includes Code Analysis warnings as well as compile-time warnings.
Last builds warnings
The Build Warnings widget shows the number of warnings produced by the latest build for a specific build definiton.
Build warnings trend
The Build warnings trend widget shows the number of build warnings for all historical build for a specific build definition.
Notes about implementation
These widgets was developed since vNext builds aren't publishing statistics to the TFS warehouse database anymore, and since VSTS doesn't support
warehouse at all.
The source code for these widgets are available at GitHub. Please Fork and contribute!