As some of you may have noticed, we encountered a snag that led to a brief unexpected pause to your monitors. 

With the situation now fully under control, we’d like to offer a bit of context and inform you of the next steps regarding repl.co monitors, the culprit of this issue. 

What happened

As you may remember, we had to throttle repl.co monitors in the past to prevent the negative impact of repl.co instability resulting in massive & frequent incidents, but keeping the keep-alive option available for free users.

Recently, Replit decided to refrain UptimeRobot users from using our service to ping their repl.co projects and keep them alive.

As a consequence of this decision, Replit removed DNS records for the repl.co domains, which forced our systems into an emergency mode to minimize the effect on other users. There was a 7-digit number of such monitors. This caused some of our monitors to briefly pause.

We were able to resolve the situation quickly, but to ensure the stability and integrity of our systems moving forward and to comply with repl.co’s request to stop pinging their endpoints, we’ll no longer be able to support these monitors. 

Moving forward, all repl.co monitors will remain stopped and the “Keep-alive mode” feature will be discontinued. Users won’t be able to unpause Replit monitors or create new ones using the repl.co domain.

What’s next

For the past few quarters we have been working hard on a brand new monitoring architecture, and we are close to getting it live in beta.

This new architecture should be not only more performant and effective, but also much more resilient to even these large-scale DNS, and any other issues.

For the immediate term, in response to this situation, we’ve also bolstered our current system to enhance its stability and avoid this type of impact on our service reliability.

We apologize for any inconvenience this may have caused and appreciate your support.