FluentD configuration: remove / in front of container names (ITISFoundation#1188)

Author: sanderegg

services/logging/fluentd/fluent.conf

@@ -42,6 +42,16 @@
   </record>
 </filter>
 
+# Clean container names (Ruby needed) by removing leading slashes
+<filter docker.**>
+  @type record_transformer
+  enable_ruby true
+  <record>
+    container_name ${record["container_name"] ? record["container_name"].sub(/^\//, '') : record["container_name"]}
+  </record>
+</filter>
+
+
 # Output to both Graylog (GELF) and Loki
 <match docker.**>
   @type copy