[4.4] Multiple systemd-journal sources are supported

syslog-ng/syslog-ng#4553

content/chapter-sources/configuring-sources-journal/_index.md

@@ -26,14 +26,13 @@ If you are using RHEL-7, the default source in the configuration is `systemd-jou
 Only one `systemd-journal()` source can be configured in the configuration file. If there is more than one `systemd-journal()` source configured, {{% param "product.abbrev" %}} will not start.
 {{% /alert %}}
 
-
 ## Declaration:
 
 ```shell
    systemd-journal(options);
 ```
 
-
+If you want to use multiple `systemd-journal()` sources in your configuration, the sources must use unique systemd namespaces. For details, see the [`namespace()` option]({{< relref "/chapter-sources/configuring-sources-journal/reference-source-journal/_index.md#namespace" >}}).
 
 ## Example: Send all fields through syslog protocol {#example-source-journal-allfields}
 

content/headless/chunk/systemd-journal-namespace.md

@@ -18,6 +18,7 @@ The following modes of operation are available:
 - If `namespace(<specific-namespace>)` is specified, the `systemd-journal()` source only reads and displays log data from the specified namespace.
 - If the namespace identifier is prefixed with `"+"` when you specify your `namespace()` option, the `systemd-journal()` source only reads and displays log data from the specified namespace and the default namespace, interleaved.
 
+Starting with {{% param "product.abbrev" %}} 4.4, you can use multiple `systemd-journal()` sources in your configuration. In this case, each source must use unique systemd namespaces.
 
 *Syntax:* `namespace(string)`