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Underlying OS upgrade for jobs that use the Docker executor

What’s New

On December 7, 2021; CircleCI upgraded the underlying operating system used to run customer containers as part of the Docker executor on CircleCI Cloud. This change is critical to ensuring the underlying infrastructure that runs your jobs continues to provide reliable and performant execution.

The upgrade of the underlying OS and kernel resulted in improved spin-up performance for jobs that use the Docker executor. For more information on the performance improvements, please see the following Discuss post.

Previous changes

Release 2.19.13    

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