We are currently seeing reports of users having trouble using Google services like gmail.com or drive.google.com. Most users are seeing slowness or a 502 error after they log in. This appears to be transient and happening at different times. Refreshing the page might help after you have waited for a few mins. but Google ultimately will need to fix things. We will post any updates as we have them.
Update: Around 4 pm pages started to respond as they should.