We upgraded and tested our test cluster successfully to Debian stretch now that all open issues are resolved.
This change makes the K8S stack more future proof because we are running on the current stable release of Debian called stretch. This also allows us to use t3, m5, c5, r5 and similar instance groups that use NVME volumes.
We are in the process of rolling out the upgrade to all the staging K8S clusters and after verification we will proceed with upgrading the production environments.