Add "apt" check command.

Refs #6002

doc/5-icinga-template-library.md

@@ -271,6 +271,12 @@ address         | **Required.** The host's address.
 oid             | **Optional.** The SNMP OID. Defaults to "1.3.6.1.2.1.1.3.0".
 community       | **Optional.** The SNMP community. Defaults to "public".
 
+### <a id="itl-apt"></a> apt
+
+Check command for the `check_apt` plugin.
+
+The `apt` check command does not support any vars.
+
 ### <a id="itl-icinga"></a> icinga
 
 Check command for the built-in `icinga` check. This check returns performance

itl/command-common.conf

@@ -275,6 +275,14 @@ object CheckCommand "snmp-uptime" {
 	vars.oid = "1.3.6.1.2.1.1.3.0"
 }
 
+object CheckCommand "apt" {
+	import "plugin-check-command"
+
+	command = [
+		PluginDir + "/check_apt"
+	]
+}
+
 object CheckCommand "icinga" {
 	import "icinga-check-command",