Server parameters can be adjusted per user/database combination. When the postgresql.conf file is reloaded via pg_ctl reload or sending the server a SIGHUP signal, the server log file notes which parameters were changed as a result. Background writer statistics can now be reset using pg_stat_reset_shared('bgwriter').
Table and function counters can be individually reset using the pg_stat_reset_single_table_counters() and pg_stat_reset_single_function_counters() functions. The log_temp_files parameter is now specified in kilobyte units and its documentation is corrected. The description in earlier versions was misleading.
The log_line_prefix option can now track the SQLSTATE value set for messages such as errors, ...
