Running Ubuntu 8.04 LTS, with postgresql-8-3, postgresql-client-8.3, postgresql-common - standard Ubuntu stable postgresql package. The same error occurs on a system with postgresql-8-2. Both boxes are also running python-psycopg2. Connections limited to localhost. Nothing monitoring or scanning port 5432 at a 5 hour interval.
I'm get the following error in the logs at startup and at the exact interval that -x /usr/sbin/pg_maintenance ]; then /usr/sbin/pg_maintenance --analyze appears to run in cron: