fix(backups): always reset the connectivity flag after a replica backup#1642
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A replica backup disables external connectivity by writing the unit peer databag "connectivity" flag to "off". The flag was only reset to "on" after the backup run via a fall-through `if disabled_connectivity:`, reachable only on the success and ExecError paths. A different exception in the backup run — or an action interruption/restart — left the flag stuck "off". Because the flag lives in the unit peer databag it survives restarts and upgrades, leaving pg_hba rejecting peer/replica connections indefinitely (the cluster can no longer talk to itself). Move the reset into a `finally` block so it runs regardless of which exception (or none) the backup run raises. Also recover deployments already stuck with a stale "off" by resetting it in _on_postgresql_pebble_ready and _on_config_changed, guarded by the cluster-wide is_creating_backup signal so a genuinely in-progress backup is not un-hidden mid-run. Signed-off-by: Marcelo Henrique Neppel <marcelo.neppel@canonical.com>
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Issue
A replica backup disables external connectivity by writing the unit peer databag
connectivityflag to"off". The flag was only reset to"on"after the backup run via a fall-throughif disabled_connectivity:, reachable only on the success andExecErrorpaths. A different exception in the backup run — or an action interruption/restart — left the flag stuck"off". Because the flag lives in the unit peer databag it survives restarts and upgrades, leavingpg_hbarejecting peer/replica connections indefinitely (the cluster can no longer talk to itself).Solution
finallyblock so it runs regardless of which exception (or none) the backup run raises."off"by resetting it in_on_postgresql_pebble_readyand_on_config_changed, guarded by the cluster-wideis_creating_backupsignal so a genuinely in-progress backup is not un-hidden mid-run.Unit tests cover the exception-path reset and the stale-flag recovery helper.
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