We were successfully able to upgrade the testnet cluster (as we have mentioned in the above post) to v1.28 yesterday. However, we will need some more time and will be doing another upgrade on Wednesday, Dec 11, from 1:00 PM to 3:00 PM CET.
There will be minimal downtime, with brief interruptions expected during the transition and testnet will be upgraded to the final version v1.30.
No specific action is needed from your side. However, we encourage developers to monitor their applications during this window and report any issues.