chore: delete unuse default value and make flapping_detect middle improtance

apps/emqx/src/emqx_flapping.erl

@@ -50,12 +50,6 @@
     started_at :: pos_integer(),
     detect_cnt :: integer()
 }).
--define(DEFAULT_POLICY, #{
-    enable => false,
-    max_count => 15,
-    window_time => 60000,
-    ban_time => 5 * 6000
-}).
 
 -opaque flapping() :: #flapping{}.
 

apps/emqx/src/emqx_schema.erl

@@ -277,7 +277,7 @@ roots(low) ->
             sc(
                 ref("flapping_detect"),
                 #{
-                    importance => ?DEFAULT_IMPORTANCE,
+                    importance => ?IMPORTANCE_MEDIUM,
                     converter => fun flapping_detect_converter/2
                 }
             )},