馃悰 `lease4-update` command has no effect and falsely reports success on multithreaded v4.
Reported on support ticket 16333, originally as a HA bug lease_cmds bug
Current behavior
A kea-dhcp4 server configured with multi-threading enabled that handles a lease4-update will report IPv4 lease updated. every time without actually adding or updating a lease.
Expected behavior
It reports IPv4 lease added. if the lease is not existing i.e. the first time. In any case, it proceeds to effectively add or update the lease.
Git patches for 1.8.0 and 1.8.1