Go to Xamarin.Forms on GitHub for new bugs. Existing Bugzilla reports are still actively tracked.

Select a component to see open bugs in that component.

Component Default Assignee
Android Bugzilla
Bugs specific to the Android backend.
Forms Bugzilla
Issues in the core Xamarin.Forms library.
iOS Bugzilla
iOS backend
Mac Bugzilla
Bugs specific to the Mac backend.
Samples Rustam Zaitov
The samples of Xamarin.Forms
Windows Bugzilla
Windows platform (includes Phone and Windows Apps)