--- postgresql-12.0/src/backend/utils/misc/postgresql.conf.sample	2019-09-30 22:06:55.000000000 +0200
+++ postgresql-12.0/src/backend/utils/misc/postgresql.conf.sample	2019-10-07 21:05:24.551000000 +0200
@@ -416,23 +416,23 @@
 
 # - Where to Log -
 
-#log_destination = 'stderr'		# Valid values are combinations of
+log_destination = 'stderr'		# Valid values are combinations of
 					# stderr, csvlog, syslog, and eventlog,
 					# depending on platform.  csvlog
 					# requires logging_collector to be on.
 
 # This is used when logging to stderr:
-#logging_collector = off		# Enable capturing of stderr and csvlog
+logging_collector = on			# Enable capturing of stderr and csvlog
 					# into log files. Required to be on for
 					# csvlogs.
 					# (change requires restart)
 
 # These are only used if logging_collector is on:
-#log_directory = 'log'			# directory where log files are written,
+log_directory = '/var/log/postgresql'	# directory where log files are written,
 					# can be absolute or relative to PGDATA
-#log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'	# log file name pattern,
+log_filename = 'postgresql-12.log'	# log file name pattern,
 					# can include strftime() escapes
-#log_file_mode = 0600			# creation mode for log files,
+log_file_mode = 0640			# creation mode for log files,
 					# begin with 0 to use octal notation
 #log_truncate_on_rotation = off		# If on, an existing log file with the
 					# same name as the new log file will be
@@ -442,16 +442,16 @@
 					# or size-driven rotation.  Default is
 					# off, meaning append to existing files
 					# in all cases.
-#log_rotation_age = 1d			# Automatic rotation of logfiles will
+log_rotation_age = 0			# Automatic rotation of logfiles will
 					# happen after that time.  0 disables.
-#log_rotation_size = 10MB		# Automatic rotation of logfiles will
+log_rotation_size = 0			# Automatic rotation of logfiles will
 					# happen after that much log output.
 					# 0 disables.
 
 # These are relevant when logging to syslog:
-#syslog_facility = 'LOCAL0'
-#syslog_ident = 'postgres'
-#syslog_sequence_numbers = on
+syslog_facility = 'LOCAL0'
+syslog_ident = 'postgresql-12'
+syslog_sequence_numbers = on
 #syslog_split_messages = on
 
 # This is only relevant when logging to eventlog (win32):
@@ -504,12 +504,12 @@
 #debug_print_plan = off
 #debug_pretty_print = on
 #log_checkpoints = off
-#log_connections = off
-#log_disconnections = off
+log_connections = on
+log_disconnections = on
 #log_duration = off
 #log_error_verbosity = default		# terse, default, or verbose messages
 #log_hostname = off
-#log_line_prefix = '%m [%p] '		# special values:
+log_line_prefix = '%m [%p] %q%h/%a %u/%d '	# special values:
 					#   %a = application name
 					#   %u = user name
 					#   %d = database name