Since 2.9.10 (we have verified that it works in 2.9.9), when lxd is added as a cloud to a k8s controller, Juju is unable to provision lxd containers for workloads.
The logs show the following error:
controller-0: 16:51:44 ERROR juju.apiserver GET(/model/94581850-9042-474d-8ebe-b60dff1f7d21/tools/2.9.10-ubuntu-amd64?%3Amodeluuid=94581850-9042-474d-8ebe-b60dff1f7d21&%3Aversion=2.9.10-ubuntu-amd64&) failed: error fetching agent binaries: cloud environ provider provider.kubernetesEnvironProvider not valid
The Open method in environs/open.go attempts includes a check to ensure that the provided argument implements the environs.CloudEnvironProvider interface. The k8s provider implementation in caas/kubernetes/provider.kubernetesEnvironProvider provides an Open() method with a different erasure for the return value (caas.Broker instead of environs.Environ; also caas.Broker does not not satisfy environs.Environ).
As a result the type check in environs/open.go fails and the above error is emitted to the logs.
Changing to High because if there is already a k8s controller with a lxd cloud that upgrades to 2.9.10+ that could be an issue.