Comment 3 for bug 1850171

Thank you for reporting this.
I am having trouble reproducing this issue locally. I've tried with landscape-scalable bundle+LXD and various scales but could not get that failure. It looks like a race condition. Also, it looks like a volatile error, as postgres logs contains successful connections from the same source host seconds later.
Could you confirm the later assumption (that the deployment is successful despite the error)

There aren't that many changes in the charm, so I suspect this change could be the one to blame:

https://code.launchpad.net/~verterok/landscape-charm/support-postgresql-charm-v2-protocol/+merge/370150