Microsoft and Apple in the news about Git*. I’m waiting for Google and Amazon to announce something too.
I believe Amazon has something similar.
Does Google also have an issue tracker?
Heck, Chrome and Android both use (separate) in-house ones.
As for issue trackers, there is the chromium one that is based off of the old Google code issue tracker [1]. And about a year ago they started exposing a newer issue tracker[2].
[0] https://cloud.google.com/container-builder/