log pg autovacuum if longer than 250ms

bubble-server/src/main/resources/packer/roles/bubble/files/postgresql.conf

@@ -467,6 +467,7 @@ stats_temp_directory = '/var/run/postgresql/9.4-main.pg_stat_tmp'
 
 #autovacuum = on			# Enable autovacuum subprocess?  'on'
 					# requires track_counts to also be on.
+log_autovacuum_min_duration = 250
 #log_autovacuum_min_duration = -1	# -1 disables, 0 logs all actions and
 					# their durations, > 0 logs only
 					# actions running at least this number