use ansible_fqdn instead of ansible_nodename

roles/install_monitoring/templates/munin-node.conf.j2

@@ -30,7 +30,7 @@ ignore_file \.pod$
 # Set this if the client doesn't report the correct hostname when
 # telnetting to localhost, port 4949
 #
-host_name {{ ansible_nodename }}
+host_name {{ ansible_fqdn }}
 
 # A list of addresses that are allowed to connect.  This must be a
 # regular expression, since Net::Server does not understand CIDR-style

roles/install_ssmtp/templates/ssmtp.conf.j2

@@ -1,6 +1,6 @@
 root=root=root@niyawe.de
 mailhub=mail.niyawe.de:465
 rewriteDomain=niyawe.de
-hostname={{ ansible_nodename }}
+hostname={{ ansible_fqdn }}
 FromLineOverride=YES
 UseTLS=YES