unit data not removed from relation

code where we add 'hostname' to the units data https://gist.github.com/jamesbeedy/2bd8429995f609919834f69d7a8b481f

Hi James,

Could you provide the unit logs from the units left? That would show if it was trying to call the event but for some reason couldn't.

How is this charm built? Is it possible that there is a typo in the departed hook name?

Is the charm public?

Also would be good to know if the charm has different behaviour on Juju 2.7 vs. 2.8

@thumper https://github.com/jamesbeedy/charm-peerer, I've also attached this as built charm.

@thumper is there anything else I can do to help move this along?

So it concretely look like:

'relation-list' is correctly reporting that the unit is gone but
'relation-get' still lets you read the old data, because that data isn't removed from the database.

Probably we are missing a cleanup step that ensures a departing unit's data is removed from the settings collections.

We could paper around it by having the Unit agent refuse to return the data if it isn't currently part of the units joined in the relation, but we should really fix it at the source.