From e007df23ef5bf45258eac2f3d35767fa3f6d5343 Mon Sep 17 00:00:00 2001
From: Zhang Huangbin <zhb@iredmail.org>
Date: Wed, 15 Sep 2021 23:38:42 +0800
Subject: [PATCH] Update upgrade.debian.10-11.html.

---
 en_US/howto/upgrade.debian.10-11.md | 13 +++++++++++++
 html/upgrade.debian.10-11.html      | 10 ++++++++++
 2 files changed, 23 insertions(+)

diff --git a/en_US/howto/upgrade.debian.10-11.md b/en_US/howto/upgrade.debian.10-11.md
index a754fe22..e50e129a 100644
--- a/en_US/howto/upgrade.debian.10-11.md
+++ b/en_US/howto/upgrade.debian.10-11.md
@@ -11,6 +11,19 @@
 SOGo team doesn't offer binary packages for Debian 11 yet, so you can not use
 SOGo at all.
 
+## Dovecot
+
+Please remove these lines from `/etc/dovecot/dovecot.conf`:
+
+```
+metric imap_command_finished {
+    event_name = imap_command_finished
+}
+```
+
+Newer Dovecot release has different syntax for metric. Since netdata doesn't
+support Dovecot-2.3 yet, we prefer removing it for now.
+
 ## iRedAPD and iRedAdmin(-Pro)
 
 Debian 11 offers newer Python release, few Python modules must be re-installed:
diff --git a/html/upgrade.debian.10-11.html b/html/upgrade.debian.10-11.html
index d630ad4b..f239faba 100644
--- a/html/upgrade.debian.10-11.html
+++ b/html/upgrade.debian.10-11.html
@@ -20,6 +20,7 @@
 <ul>
 <li><a href="#fixes-you-need-after-upgrading-debian-from-10-to-11">Fixes you need after upgrading Debian from 10 to 11</a><ul>
 <li><a href="#sogo-groupware">SOGo Groupware</a></li>
+<li><a href="#dovecot">Dovecot</a></li>
 <li><a href="#iredapd-and-iredadmin-pro">iRedAPD and iRedAdmin(-Pro)</a></li>
 <li><a href="#php-fpm">php-fpm</a></li>
 </ul>
@@ -33,6 +34,15 @@
 <h2 id="sogo-groupware">SOGo Groupware</h2>
 <p>SOGo team doesn't offer binary packages for Debian 11 yet, so you can not use
 SOGo at all.</p>
+<h2 id="dovecot">Dovecot</h2>
+<p>Please remove these lines from <code>/etc/dovecot/dovecot.conf</code>:</p>
+<pre><code>metric imap_command_finished {
+    event_name = imap_command_finished
+}
+</code></pre>
+
+<p>Newer Dovecot release has different syntax for metric. Since netdata doesn't
+support Dovecot-2.3 yet, we prefer removing it for now.</p>
 <h2 id="iredapd-and-iredadmin-pro">iRedAPD and iRedAdmin(-Pro)</h2>
 <p>Debian 11 offers newer Python release, few Python modules must be re-installed:</p>
 <pre><code>pip3 install -U web.py