From: Bruce Momjian <bruce@momjian.us>
Date: Mon, 17 Oct 2022 19:07:03 +0000 (-0400)
Subject: doc:  warn pg_stat_reset() can cause vacuum/analyze problems
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doc:  warn pg_stat_reset() can cause vacuum/analyze problems

The fix is to run ANALYZE.

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Backpatch-through: 10
---

diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index 93a84fe28b8..cb912f60f7d 100644
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -4728,6 +4728,17 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
     </tgroup>
    </table>
 
+  <warning>
+   <para>
+    Using <function>pg_stat_reset()</function> also resets counters that
+    autovacuum uses to determine when to trigger a vacuum or an analyze.
+    Resetting these counters can cause autovacuum to not perform necessary
+    work, which can cause problems such as table bloat or out-dated
+    table statistics.  A database-wide <command>ANALYZE</command> is
+    recommended after the statistics have been reset.
+   </para>
+  </warning>
+
   <para>
    <function>pg_stat_get_activity</function>, the underlying function of
    the <structname>pg_stat_activity</structname> view, returns a set of records