Update (March 1, 1730 UTC): Occasional testing of fixes caused some additional heartbeat delays over the last two hours. However, we've finally identified the problem and are implementing a stable fix that will last indefinitely. It won't be until next week that the bug itself will be fixed, but there should be no further issues.
Update (March 1, 1535 UTC): After hours of debugging this morning, our FogBugz team lead found a solid lead on what the problem is. We aren't ready to deploy a true fix, yet, but we have made great strides in reducing the impact of the problem. The majority of customers should be back to normal, and a permanent fix should be forthcoming in hopefully the next hour. Thank you for bearing with us!
Heartbeat, which is the system that controls periodic functions in FogBugz (primarily sending/receiving email and indexing cases for search and filtering) is currently experiencing performance problems.
Typical customers are experiencing lag times up to approximately five minutes, perhaps longer depending on the number of mailboxes configured. No email is being lost. Outgoing mail is being properly queued, and incoming mail with sit safely in its mailbox until FogBugz can complete the heartbeat process.
Our engineers are currently debugging the problem. However, the crashes causing the issue are intermittent and must be caught in the act, complicating the situation. As soon as a root cause and solution can be found, we will deploy a fix. We'll keep this blog up to date as we learn more.