Sorry for the late reply on your user group question.
Times are quite busy at AxonIQ, so we quick resolution of questions here does not always have priority.
Regardless, I have seen your issue on GitHub, for which we’re entering a happy state for resolution as far as I know.
I’d however like to point out that the issue you’ve opened is resolving it for the Spring Cloud Extension.
You’re stating that you utilize Axon 3 however.
In Axon 3, the Spring Cloud Command Router is still part of the main Axon Framework repository.
If you’d thus require this change to be part of Axon 3.x, that justifies another PR in that repository too.
A more pragmatic, quick resolution in your project might be to include your own
SpringCloudCommandRouter implementation which resolve the missing implementation of ServiceInstance#getMetadata() in Spring Cloud Kubernetes.
Hope this helps you out further Michael, and that it might serve as a reference for other readers experiencing the same issues.