Google's status page states that all issues are resolved on their end.
Thanks again for your patience and understanding.
Jul 17, 20:47 UTC
Google is now reporting that the issue should be resolved for the majority of users. We can confirm Tracker is currently up and running.
We will continue to monitor the situation, and will update with any news.
Jul 17, 20:02 UTC
We're urgently working on bringing Tracker back up. This is an unexpected outage and we'll provide updates here as soon as we've identified the problem or have any news.
Until then, you're welcome to email email@example.com
and we'll provide the best answers and help that we can.
Jul 17, 19:31 UTC