Add GenericCLF log format for access logs

traefik.sample.yml

@@ -79,12 +79,16 @@ entryPoints:
   #
 #  filePath: /path/to/log/log.txt
 
-  # Format is either "json" or "common".
+  # Format is either "json", "common", or "genericCLF".
+  # - "common": Traefik's extended CLF format (default)
+  # - "genericCLF": Standard CLF format compatible with standard log analyzers
+  # - "json": JSON format for structured logging
   #
   # Optional
   # Default: "common"
   #
 #  format: json
+#  format: genericCLF
 
 ################################################################
 # API and dashboard configuration