Move log_autovacuum_min_duration into its correct sections

This GUC has already been classified as LOGGING_WHAT, but its location
in postgresql.conf.sample and the documentation did not reflect that, so
fix those inconsistencies.

Author: Justin Pryzby
Discussion: https://postgr.es/m/20210404012546.GK6592@telsasoft.com

doc/src/sgml/config.sgml

@@ -6812,6 +6812,34 @@ local0.*    /var/log/postgresql
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-log-autovacuum-min-duration" xreflabel="log_autovacuum_min_duration">
+      <term><varname>log_autovacuum_min_duration</varname> (<type>integer</type>)
+      <indexterm>
+       <primary><varname>log_autovacuum_min_duration</varname></primary>
+       <secondary>configuration parameter</secondary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Causes each action executed by autovacuum to be logged if it ran for at
+        least the specified amount of time.  Setting this to zero logs
+        all autovacuum actions. <literal>-1</literal> (the default) disables
+        logging autovacuum actions.
+        If this value is specified without units, it is taken as milliseconds.
+        For example, if you set this to
+        <literal>250ms</literal> then all automatic vacuums and analyzes that run
+        250ms or longer will be logged.  In addition, when this parameter is
+        set to any value other than <literal>-1</literal>, a message will be
+        logged if an autovacuum action is skipped due to a conflicting lock or a
+        concurrently dropped relation.  Enabling this parameter can be helpful
+        in tracking autovacuum activity.  This parameter can only be set in
+        the <filename>postgresql.conf</filename> file or on the server command line;
+        but the setting can be overridden for individual tables by
+        changing table storage parameters.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-log-checkpoints" xreflabel="log_checkpoints">
       <term><varname>log_checkpoints</varname> (<type>boolean</type>)
       <indexterm>
@@ -7827,34 +7855,6 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
       </listitem>
      </varlistentry>
 
-     <varlistentry id="guc-log-autovacuum-min-duration" xreflabel="log_autovacuum_min_duration">
-      <term><varname>log_autovacuum_min_duration</varname> (<type>integer</type>)
-      <indexterm>
-       <primary><varname>log_autovacuum_min_duration</varname></primary>
-       <secondary>configuration parameter</secondary>
-      </indexterm>
-      </term>
-      <listitem>
-       <para>
-        Causes each action executed by autovacuum to be logged if it ran for at
-        least the specified amount of time.  Setting this to zero logs
-        all autovacuum actions. <literal>-1</literal> (the default) disables
-        logging autovacuum actions.
-        If this value is specified without units, it is taken as milliseconds.
-        For example, if you set this to
-        <literal>250ms</literal> then all automatic vacuums and analyzes that run
-        250ms or longer will be logged.  In addition, when this parameter is
-        set to any value other than <literal>-1</literal>, a message will be
-        logged if an autovacuum action is skipped due to a conflicting lock or a
-        concurrently dropped relation.  Enabling this parameter can be helpful
-        in tracking autovacuum activity.  This parameter can only be set in
-        the <filename>postgresql.conf</filename> file or on the server command line;
-        but the setting can be overridden for individual tables by
-        changing table storage parameters.
-       </para>
-      </listitem>
-     </varlistentry>
-
      <varlistentry id="guc-autovacuum-max-workers" xreflabel="autovacuum_max_workers">
       <term><varname>autovacuum_max_workers</varname> (<type>integer</type>)
       <indexterm>

src/backend/utils/misc/postgresql.conf.sample

@@ -531,6 +531,11 @@
 #debug_print_rewritten = off
 #debug_print_plan = off
 #debug_pretty_print = on
+#log_autovacuum_min_duration = -1	# log autovacuum activity;
+					# -1 disables, 0 logs all actions and
+					# their durations, > 0 logs only
+					# actions running at least this number
+					# of milliseconds.
 #log_checkpoints = off
 #log_connections = off
 #log_disconnections = off
@@ -616,10 +621,6 @@
 
 #autovacuum = on			# Enable autovacuum subprocess?  'on'
 					# requires track_counts to also be on.
-#log_autovacuum_min_duration = -1	# -1 disables, 0 logs all actions and
-					# their durations, > 0 logs only
-					# actions running at least this number
-					# of milliseconds.
 #autovacuum_max_workers = 3		# max number of autovacuum subprocesses
 					# (change requires restart)
 #autovacuum_naptime = 1min		# time between autovacuum runs