bundles/icinga2: support specifying an alternative host for checks

bundles/icinga2/files/icinga2/hosts.conf

@@ -5,7 +5,7 @@ object Host "${monitored_node.name}" {
   vars.os = "Linux"
   vars.sla = "${monitored_node.metadata.get('sla', '24x7')}"
   vars.period = "${sla_info[monitored_node.metadata.get('sla', '24x7')]}"
-  address = "${monitored_node.hostname}"
+  address = "${monitored_node.metadata.get('icinga_options', {}).get('hostname', monitored_node.hostname)}"
 }
 % endfor
 

nodes/home/router.py

@@ -41,6 +41,9 @@ nodes['home.router'] = {
             # day.
             'restart_pppd': '23 2 * * *    root    systemctl restart pppoe',
         },
+        'icinga_options': {
+            'hostname': 'franzi-home.kunbox.net',
+        },
         'iptables': {
             'custom_rules': [
                 # This is a router. Allow forwarding traffic for all internal networks.