Capsule Status Page

Mar 27, 2026 · resolved Mar 27

# Incident Summary On Friday, March 27, 2026, Capsule experienced several periods of slow performance and some temporary outages. These were caused by two separate and unrelated issues: * A recent software update that unintentionally caused parts of the system to become stuck. * An uncommon data pattern which led to degraded performance under specific conditions. Both issues have now been resolved. The first was fixed by rolling back the recent update, and the second by mitigating the data pattern that caused the issue. At no point was any customer data impacted. # Timeline of Events _\(All times are UTC\)_ * **00:01** – A small number of users began experiencing errors when using the web app and API. * **01:00** – Errors increased significantly, triggering an alert to our on-call engineers. Investigation began. * **01:35** – The team observed locking behavior and replacement servers deployed to mitigate. * **02:09** – Service appeared stable, with further investigation ongoing. * **08:37** – Errors reappeared for a small number of users. * **08:46** – Errors increased again, and engineers were alerted. Initially thought to be a repeat of the earlier issue. * **08:54** – Initial fixes were applied, partially restoring service. * **09:12** – The earlier issue was fully identified and fixed by reverting the problematic update. * **09:34** – While monitoring the fix, a second issue was observed. * **09:54** – The cause of the second issue was identified, linked to an uncommon data pattern. Fixes were applied and service was restored. * **12:30** – Reprocessing this data caused another spike in errors. * **13:00** – Mitigation put in place for the data pattern, and full service was restored. # Next Steps We are carrying out a full internal review of both issues. Based on this, we will introduce additional safeguards to prevent similar problems from happening again.

Oct 10, 2024 · resolved Oct 10

This incident has been resolved.

Dec 9, 2023 · resolved Dec 10

This incident has been resolved.

Jun 21, 2023 · resolved Jun 21

We believe this third party routing issue affecting a number of UK based ISPs has now been resolved.

Mar 27, 2023 · resolved Mar 27

We're very sorry if you suffered from the periods of slow responses and elevated error rates with Capsule yesterday. We’ve tracked the issue down the a bug in our data stores query optimiser that resulted in what should have been a fast responding query taking several minutes to complete. This only happens in rare situations with an unusual configuration of data. While we fully understand the exact nature of the optimiser bug we have applied a fix that stops the bug from occurring. Once again we’re sorry for this disruption this caused.