Monitoring of servers time
As local time set on servers that serve web content is critical to proper function (localStorage cache on user browsers gets out of sync), you should have some monitoring to ensure they all have local time set right. Few days ago you fixed time on one server, but seems there is at least one another, which is still ~14 seconds behind. Would be great to fix it and avoid such errors in the future.
All the servers do have an automated process that runs to keep the time in sync. I had found one where that process had failed, but all the other ones were working. I'll have to look again, but I'm not sure how to force it to be any more automatic.