icinga2: Check DHCP pool usage every 10m.

Signed-off-by: Maximilian Wilhelm <max@rfc2324.org>

icinga2/services/dhcp-server.conf

@@ -9,6 +9,7 @@ apply Service "dhcp_pool" {
         import "generic-service"
 
 	check_command = "dhcp_pool"
+	check_interval = 10m
 
 	if (host.name != NodeName) {
 		command_endpoint = host.name