Resolved after 1 hour 29 minutes, on December 17, 2025.
### **When it happened:** Wednesday, December 17th 2025, 10:37 UTC - Thursday, December 18th 2025, 11:59 UTC ### **What happened:** Applications were unable to be downloaded via Mobile App Distribution for a subset of customers. ### **Why it happened:** A product change combined with an increased and sustained load resulted in higher resource usage than anticipated, exceeding established limits for certain clients. ### **How we fixed it:** The service was rolled back to a stable version. ### **What we are doing to prevent it from happening again:** There are multiple improvements planned. 1. Improved monitoring & alerting, 2. Enhanced post-deployment validation 3. Capacity planning forecasting 4. More advanced communication where possible ahead of major changes 5. Adding canary to the roll out process
Update timeline
- resolved Dec 18, 2025, 03:52 PM UTC
Between 10:37 UTC December 17th and 11:59 UTC December 18th, we were experiencing issues downloading applications via Mobile App Distribution. This issue has been resolved. All services are fully operational.
- postmortem Jan 05, 2026, 04:04 PM UTC
### **When it happened:** Wednesday, December 17th 2025, 10:37 UTC - Thursday, December 18th 2025, 11:59 UTC ### **What happened:** Applications were unable to be downloaded via Mobile App Distribution for a subset of customers. ### **Why it happened:** A product change combined with an increased and sustained load resulted in higher resource usage than anticipated, exceeding established limits for certain clients. ### **How we fixed it:** The service was rolled back to a stable version. ### **What we are doing to prevent it from happening again:** There are multiple improvements planned. 1. Improved monitoring & alerting, 2. Enhanced post-deployment validation 3. Capacity planning forecasting 4. More advanced communication where possible ahead of major changes 5. Adding canary to the roll out process
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