July 2020 VCL release
Today the minimum version of VCL available across our network increased, unlocking the following changes:
These variables all relate to the concept of staleness and revalidation. They are intended to help developers get a better understanding of the state of stale content, which can help with performance monitoring and observability in general.
Prior change: CLI v0.16.1
Following change: September 2020 VCL release ("Cheerios")