vacuum monitoring in the doc

Hello,

I find that 2 informations on vacuum are quite hard to find in the doc:

- "log_autovacuum_min_duration" is not listed in "What to log"

 ( http://www.postgresql.org/docs/9.1/static/runtime-config-logging.html#RUNTIME-CONFIG-LOGGING-WHAT )

- There is no hint on how to monitor vaccum in the main chapter

 ( http://www.postgresql.org/docs/9.1/static/routine-vacuuming.html )

  A hint on pg_stat_all_tables would be helpful.

  ( http://www.postgresql.org/docs/9.1/static/monitoring-stats.html#MONITORING-STATS-VIEWS-TABLE )

best regards,

Marc Mamin