fix 2 broken newrelic method instrumentations

lib/helpers.rb

@@ -299,7 +299,7 @@ helpers do
   add_method_tracer :thread
   add_method_tracer :comment
   add_method_tracer :flag_as_abuse
-  add_method_tracer :unflag_as_abuse
+  add_method_tracer :un_flag_as_abuse
   add_method_tracer :author_contents_only
   add_method_tracer :handle_threads_query
 

models/comment_thread.rb

@@ -309,7 +309,9 @@ private
     subscriptions.delete_all
   end
 
-  include ::NewRelic::Agent::MethodTracer
-  add_method_tracer :perform_search
+  class << self
+    include ::NewRelic::Agent::MethodTracer
+    add_method_tracer :perform_search, 'Custom/perform_search'
+  end
 
 end