Comment 1 for bug 1836063

Adding juju to get their input.

We have the following situation: one of the kubernetes-master units fail with upgrade-charm hook failed. That hook is called right after install on that unit.
None of the units run that hook.

Looking more deeper with debug-hooks, we've found out that .unit-state.db never gets populated on this unit, whereas other 2 units get all their relation info into kv table. That causes this specific unit to fail.