Sauce Labs Maintenance Windows for Sauce Labs
Customers may experience intermittent errors during automated browser and virtual mobile device tests in our US-West-1 datacenter. We are closely monitoring and investigating the affected services.
2023-April-11 Service Incident-2
Incident Report for Sauce Labs


Tuesday April 11 2023, 04/11/2023 19:02 UTC - Wednesday April 12 2023, 08:00 UTC

What happened:

Tests running on desktop and virtual mobile devices experienced high wait times and error rates at session start. 

Why it happened:

The data store supporting VM state management reached CPU saturation, causing periodic outages of our VM state management service, each lasting 2-10 minutes in length. As a result, not enough capacity was autoscaled to meet demand.

How we fixed it:

A number of service and infrastructure changes were made to reduce the CPU utilization of the data store.

  • Reducing the number of CPU-heavy queries
  • Splitting some state management workflows to new, separate data stores

What we are doing to prevent it from happening again:

  • Monitoring will be improved to better identify this failure case in the future.
  • We will continue to separate workflows into separate datastores to mitigate against resource saturation and reduce blast radius.
Posted Apr 17, 2023 - 22:38 UTC

After taking remedial action, wait times are normal in our US datacenter and all services are fully operational.
Posted Apr 12, 2023 - 00:23 UTC
After taking remedial action, we are seeing improved launch times.
We are currently monitoring.
Posted Apr 12, 2023 - 00:06 UTC
We continue to see elevated wait times in our US datacenter. We continue to investigate.
Posted Apr 11, 2023 - 22:19 UTC
We are experiencing elevated wait times in our US datacenter, which may cause tests to be slow to start. We are investigating.
Posted Apr 11, 2023 - 21:48 UTC
This incident affected: Automated Browser Testing (US-West), Automated Virtual Mobile Device Testing (US-West), Live Browser Testing (US-West), and Live Virtual Mobile Device Testing (US-West).