puppet: Use PostgreSQL's internal logging system

This also requires disabling logrotate for postgres log files.

(imported from commit eeedb87a4f488829c59eddecc041654e762d6d0e)

servers/puppet/files/postgresql/postgresql.conf

@@ -374,7 +374,7 @@ ssl = true				# (change requires restart)
 #log_duration = off
 #log_error_verbosity = default		# terse, default, or verbose messages
 #log_hostname = off
-log_line_prefix = '%t '			# special values:
+#log_line_prefix = '%t '		# special values:
 					#   %a = application name
 					#   %u = user name
 					#   %d = database name
@@ -567,3 +567,13 @@ timezone = 'UTC'
 # EBS supposedly has very similar sequential and random access performance
 random_page_cost = 1.1
 listen_addresses = '*'
+
+log_destination = 'stderr'
+logging_collector = on
+log_directory = '/var/log/postgresql'
+log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'
+log_rotation_age = 7d
+log_rotation_size = 100MB
+log_min_duration_statement = 500
+log_line_prefix = '%m %c/%p '
+log_lock_waits = on

servers/puppet/manifests/site.pp

@@ -357,6 +357,10 @@ class humbug_postgres {
                   Common::Append_if_no_such_line['shmall'],
                 ],
   }
+
+  exec { "disable_logrotate":
+    command => "dpkg-divert --rename --divert /etc/logrotate.d/postgresql-common.disabled --add /etc/logrotate.d/postgresql-common"
+  }
 }
 
 class { "humbug_base": }