We've added xmin info to pg_stat_activity and pg_stat_replication, but VACUUM doesn't yet report which xmin value it used when it ran.
Small patch to add this info to VACUUM output. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
vacuum_report_oldestxmin.v1.patch
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