[shkkmo]

Github isn't setup to stop your from moving your project to other hosting providers. You can export GitHub to other git hosting setups (like a self-hosted GitLab.)

[mjw1007]

Does github provide a way to redirect the URLs for individual issues to the corresponding issues on a new bugtracker?

[shkkmo]

Probablu not, but you could probably find or write a script to close all the github issues with a final comment linking to the duplicated issue on the new tracker.

[ReactiveJelly]

Including the issues?

[shkkmo]

Yes, and other things, see: https://docs.gitlab.com/ee/user/project/import/github.html