dovecot: Update munin plugin & configure it

dovecot/files/munin_config

@@ -0,0 +1,2 @@
+[dovecot]
+group adm

dovecot/files/munin_plugin

@@ -8,6 +8,7 @@
 # Contributions by:
 # - Stephane Enten <tuf@delyth.net>
 # - Steve Schnepp <steve.schnepp@pwkf.org>
+# - pcy <pcy@ulyssis.org> (make 'Connected Users' DERIVE, check existence of logfile in autoconf)
 #
 # Parameters understood:
 #
@@ -34,13 +35,13 @@ LOGFILE=${logfile:-/var/log/mail.log}
 ######################
 
 if [ "$1" = "autoconf" ]; then
-	echo yes
+	[ -f "$LOGFILE" ] && echo yes || echo "no (logfile $LOGFILE not found)"
 	exit 0
 fi
 
 if [ "$1" = "config" ]; then
 	echo 'graph_title Dovecot Logins'
-	echo 'graph_category Mail'
+	echo 'graph_category mail'
 	echo 'graph_args --base 1000 -l 0'
 	echo 'graph_vlabel Login Counters'
 
@@ -53,6 +54,7 @@ if [ "$1" = "config" ]; then
 	done
 
 	echo 'connected.label Connected Users'
+	echo "connected.type DERIVE"
 
 	exit 0
 fi

dovecot/tasks/munin.yml

@@ -14,8 +14,10 @@
         dest: /etc/munin/plugins/dovecot
         mode: "0755"
 
-# TODO : add in /etc/munin/plugin-conf.d/munin-node
-# [dovecot]
-# group adm
+    - name: Install munin config
+      copy:
+        src: munin_config
+        dest: /etc/munin/plugin-conf.d/dovecot
+        mode: "0644"
 
   when: munin_node_plugins_config.stat.exists