Charm blocked with message "PostgreSQL config from previous install found at /etc/postgresql/12/main/postgresql.conf"

[Bas de Bruijne]

Test run https://solutions.qa.canonical.com/testruns/f3ad4a3d-427b-484a-a930-0ac726c11305/ fails during the landscape bundle install because the postgres charm is blocked in the following status:

=================
App Version Status Scale Charm Channel Rev Exposed Message
haproxy active 1 haproxy stable 66 yes Unit is ready
landscape-server waiting 1 landscape-server stable 87 no Waiting on relations: db
postgresql blocked 1 postgresql latest/stable 270 no PostgreSQL config from previous install found at /etc/postgresql/12/main/postgresql.conf
rabbitmq-server 3.8.2 active 1 rabbitmq-server stable 123 no Unit is ready

Unit Workload Agent Machine Public address Ports Message
haproxy/0* active idle 3 10.246.164.142 80,443/tcp Unit is ready
landscape-server/0* waiting idle 2 10.246.166.91 Waiting on relations: db
postgresql/0* blocked idle 0 10.246.167.111 PostgreSQL config from previous install found at /etc/postgresql/12/main/postgresql.conf
rabbitmq-server/0* active idle 1 10.246.166.191 5672/tcp Unit is ready
=================

The logs show no particular error at first glance. The crashdumps are here: https://oil-jenkins.canonical.com/artifacts/f3ad4a3d-427b-484a-a930-0ac726c11305/generated/generated/landscape/juju-crashdump-landscape-2023-10-04-00.44.19.tar.gz

This is possibly a duplicate of LP: #1831858

More configs and crashdumps can be found here: https://oil-jenkins.canonical.com/artifacts/f3ad4a3d-427b-484a-a930-0ac726c11305/index.html

[Bas de Bruijne (basdbruijne)]

Also adding landscape-bundles, since postgresql is pinned to 270 by the bundle from the landscape team