Firewall/Aliases - add overview for https://github.com/opnsense/docs/issues/440

source/manual/aliases.rst

@@ -8,6 +8,24 @@ changes.
 
 Aliases can be added, modified and removed via :menuselection:`Firewall --> Aliases`.
 
+-----------------------------------
+Overview
+-----------------------------------
+
+The page opens with an overview of the aliases available, including some internal ones available from installed software.
+At the top of the page you can search for aliases or preselect various types or categories to which they belong.
+
+In order to gain some insights into the current status of the plugins, two additional (meta) fields are being displayed, being:
+
+* Loaded#
+
+  * Shows the amount of entries planned to install into the table, in case there's not enough memory available to load the
+    item in question, one can easily find the alias causing the overflow in table entries (bar at the right top of the page)
+
+* Last updated
+
+    * Shows the last timestamp from the entries saved to disk.
+
 -----------
 Alias Types
 -----------