MONGOID-4811 Output controller runtime stats in milliseconds (#5309)

Author: neilshweky

lib/mongoid/railties/controller_runtime.rb

@@ -62,7 +62,7 @@ class Collector
         def started _; end
 
         def _completed e
-          Collector.runtime += e.duration
+          Collector.runtime += e.duration * 1000
         end
         alias :succeeded :_completed
         alias :failed :_completed

spec/rails/controller_extension/controller_runtime_spec.rb

@@ -30,11 +30,11 @@ def clear_metric!
 
       clear_metric!
       instance.succeeded event_payload
-      expect(collector.runtime).to eq(42)
+      expect(collector.runtime).to eq(42000)
 
       clear_metric!
       instance.failed event_payload
-      expect(collector.runtime).to eq(42)
+      expect(collector.runtime).to eq(42000)
     end
 
     it "resets the metric and returns the value" do