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notifications/index.html

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   <li class="md-nav__item">
-    <a href="../credential-helpers/" title="Credential helpers" class="md-nav__link">
-      Credential helpers
+    <a href="../private-registries/" title="Private registries" class="md-nav__link">
+      Private registries
     </a>
   </li>
 
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+      
+      
+      
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+  <li class="md-nav__item">
+    <a href="../lifecycle-hooks/" title="Lifecycle hooks" class="md-nav__link">
+      Lifecycle hooks
+    </a>
+  </li>
+
+    
   </ul>
 </nav>
                   </div>
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                 <h1 id="notifications">Notifications<a class="headerlink" href="#notifications" title="Permanent link">&para;</a></h1>
 <p>Watchtower can send notifications when containers are updated. Notifications are sent via hooks in the logging system, <a href="http://github.com/sirupsen/logrus">logrus</a>.
-The types of notifications to send are passed via the comma-separated option <code>--notifications</code> (or corresponding environment variable <code>WATCHTOWER_NOTIFICATIONS</code>), which has the following valid values:</p>
+The types of notifications to send are set by passing a comma-separated list of values to the <code>--notifications</code> option (or corresponding environment variable <code>WATCHTOWER_NOTIFICATIONS</code>), which has the following valid values:</p>
 <ul>
 <li><code>email</code> to send notifications via e-mail</li>
 <li><code>slack</code> to send notifications through a Slack webhook</li>
 <li><code>msteams</code> to send notifications via MSTeams webhook</li>
 <li><code>gotify</code> to send notifications via Gotify</li>
 </ul>
+<blockquote>
+<p>There is currently a <a href="https://github.com/spf13/viper/issues/380">bug</a> in Viper, which prevents comma-separated slices to be used when using the environment variable. A workaround is available where we instead put quotes around the environment variable value and replace the commas with spaces, as <code>WATCHTOWER_NOTIFICATIONS="slack msteams"</code></p>
+<p>If you're a <code>docker-compose</code> user, make sure to specify environment variables' values in your <code>.yml</code> file without double quotes (<code>"</code>). </p>
+<p>This prevents unexpected errors when watchtower starts.</p>
+</blockquote>
 <h2 id="settings">Settings<a class="headerlink" href="#settings" title="Permanent link">&para;</a></h2>
 <ul>
 <li><code>--notifications-level</code> (env. <code>WATCHTOWER_NOTIFICATIONS_LEVEL</code>): Controls the log level which is used for the notifications. If omitted, the default log level is <code>info</code>. Possible values are: <code>panic</code>, <code>fatal</code>, <code>error</code>, <code>warn</code>, <code>info</code> or <code>debug</code>.</li>
@@ -533,6 +550,7 @@ The types of notifications to send are passed via the comma-separated option <co
 <li><code>--notification-email-server-user</code> (env. <code>WATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER</code>): The username to authenticate with the SMTP server with.</li>
 <li><code>--notification-email-server-password</code> (env. <code>WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD</code>): The password to authenticate with the SMTP server with.</li>
 <li><code>--notification-email-delay</code> (env. <code>WATCHTOWER_NOTIFICATION_EMAIL_DELAY</code>): Delay before sending notifications expressed in seconds.</li>
+<li><code>--notification-email-subjecttag</code> (env. <code>WATCHTOWER_NOTIFICATION_EMAIL_SUBJECTTAG</code>): Prefix to include in the subject tag. Useful when running multiple watchtowers.</li>
 </ul>
 <p>Example:</p>
 <pre><code class="bash">docker run -d \
@@ -599,6 +617,7 @@ The types of notifications to send are passed via the comma-separated option <co
                 
                   
                 
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