Add documentation for the "icinga" check command.

Fixes #5326

diff --git a/doc/5-icinga-template-library.md b/doc/5-icinga-template-library.md
index e663779fcc007f8f40c9d8d1f79ab9fb1a18bc6d..3835f586c1eed9bc9556dc830f7f66c8157f0478 100644 (file)
--- a/doc/5-icinga-template-library.md
+++ b/doc/5-icinga-template-library.md
@@ -260,3 +260,10 @@ plugindir       | **Required.** The directory containing this plugin.
 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".
+
+### icinga
+
+Check command for the built-in `icinga` check. This check returns performance
+data for the current Icinga instance.
+
+The `icinga` check command does not support any macros.