Comment 1 for bug 1825288

Can you tell us more about their deployment? Is kubeapi-load-balancer colocated with another unit on the same machine?

I ask because kubernetes-master and kubernetes-worker both delete /srv/kubernetes [1][2] on charm upgrade, and this seems like the most likely explanation.

[1]: https://github.com/charmed-kubernetes/charm-kubernetes-master/blob/28610d903ac798b3f9df4897b8f5d8bf9652e9fe/reactive/kubernetes_master.py#L269
[2]: https://github.com/charmed-kubernetes/charm-kubernetes-worker/blob/1006bb62681be7f7a74e90e2c3d7401afffb51c4/reactive/kubernetes_worker.py#L194