1 files changed, 6 insertions, 4 deletions
diff --git a/munin-plugin b/munin-plugin
index 8c18a87..ecd8764 100755
--- a/munin-plugin
+++ b/munin-plugin
@@ -50,10 +50,12 @@ if (!$ARGV[0]) {
 
 sub label2key {
     my $label = shift;
-    # Removing illegal characters.  Apparently using '_' as a
-    # replacement character break graph generation with version 1.2.5.
-    $label =~ s/[^a-zA-Z0-9]+//g;
-    return $label;
+    # Clean using method described on
+    # http://munin-monitoring.org/wiki/notes_on_datasource_names
+    $label =~ s/^[^A-Za-z_]/_/;
+    $label =~ s/[^A-Za-z0-9_]/_/g;
+
+    return "$label";
 }
 
 sub handle_host {