More detailed cache_logging

config/environments/production.rb

@@ -61,6 +61,9 @@
   # Full error reports are disabled and caching is turned on.
   config.consider_all_requests_local = false
   config.action_controller.perform_caching = true
+  # debugging: check if cache is being hit
+  # (it should show [cache hit] even if set to false)
+  config.action_controller.enable_fragment_cache_logging = true
 
   # Enable Rack::Cache to put a simple HTTP cache in front of your application
   # Add `rack-cache` to your Gemfile before enabling this.