anchor.diff:  
   # - Process Title -
   
  -cluster_name = '11/main'			# added to process titles if nonempty
  +cluster_name = '<%= scope["zulip::base::postgres_version"] %>/main'			# added to process titles if nonempty
   					# (change requires restart)
   #update_process_title = on
   
  
positive.code: #track_io_timing = off
  #track_functions = none			# none, pl, all
  #track_activity_query_size = 1024	# (change requires restart)
  stats_temp_directory = '/var/run/postgresql/11-main.pg_stat_tmp'
  
  
  # - Statistics Monitoring -
  
negative.code: #------------------------------------------------------------------------------
  
  # Add settings for extensions here
  timezone = 'UTC'
  default_text_search_config = 'zulip.english_us_search'
  
  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]: [%l-1] '
  log_checkpoints = on
  log_lock_waits = on
  log_temp_files = 0
  log_autovacuum_min_duration = 100
  
  autovacuum_freeze_max_age = 2000000000
  vacuum_freeze_min_age     = 1000000000
  vacuum_freeze_table_age   = 1800000000
  
  # Performance settings
  maintenance_work_mem = <%= scope["zulip::postgres_appdb_tuned::maintenance_work_mem"] %>MB
  effective_cache_size = <%= scope["zulip::postgres_appdb_tuned::effective_cache_size"] %>MB
  work_mem = <%= scope["zulip::postgres_appdb_tuned::work_mem"] %>MB
  shared_buffers = <%= scope["zulip::postgres_appdb_tuned::shared_buffers"] %>MB
  wal_buffers = 4MB
  checkpoint_completion_target = 0.7
  <% if @random_page_cost != '' -%>
  random_page_cost = <%= @random_page_cost %>
  <% end -%>
  <% if @effective_io_concurrency != '' -%>
  effective_io_concurrency = <%= @effective_io_concurrency %>
  <% end -%>
  
  <% if @listen_addresses != '' -%>
  listen_addresses = <%= @listen_addresses %>
  <% end -%>
  
  <% if @replication != '' -%>
  # Master replication settings (ignored on standby)
  wal_level = hot_standby
  max_wal_senders = 5
  archive_mode = on
  archive_command = '/usr/local/bin/env-wal-e wal-push %p'
  
  # Standby replication settings (ignored on master)
  hot_standby = on
  <% end -%>
  
  <% if @ssl_cert_file != '' -%>
  ssl_cert_file = '<%= @ssl_cert_file %>'		# (change requires restart)
  <% end -%>
  <% if @ssl_key_file != '' -%>
  ssl_key_file = '<%= @ssl_key_file %>'		# (change requires restart)
  <% end -%>
  <% if @ssl_ca_file != '' -%>
  ssl_ca_file = '<%= @ssl_ca_file %>'		# (change requires restart)
  <% end -%>
  