mono/monodevelop — comment on commit 580f92041ff943d0dfbdcc3086fc75cbde83983c
File: main/src/core/MonoDevelop.Ide/MonoDevelop.Ide/FeedbackUrlProvider.cs line 30
By mhutch:

Interfaces should begin with I.

Though in this case you'd be better off having a custom extension node and registering the URL directly in the addin file, instead of requiring a class.