Looks like /etc/cron.d/postgresql-common
# Run VACUUM ANALYSE on all databases every 5 hours if pg_autovacuum is not
# running
2 0,5,10,15,20 * * 1-6 root if [ -x /usr/sbin/pg_maintenance ]; then
/usr/sbin/pg_maintenance --analyze >/dev/null; fi
Is deprecated for postgresql versions 8.1 and higher and needs to be
commented out by default in those packages.
The pg_maintenance scripts check the state of the autovacuuum flag in the
postgres config files. If it is enabled they simply quit and don't do
anything. Disabling autovacuum causes them to run... So you can leave them
uncommented...
Although why it causes the "Incomplete start-up packet" messages is a
mystery...
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