diff --git a/src/emqx_zone.erl b/src/emqx_zone.erl
index 90d56eb0e..386b71af7 100644
--- a/src/emqx_zone.erl
+++ b/src/emqx_zone.erl
@@ -25,27 +25,58 @@
 
 -logger_header("[Zone]").
 
+-compile({inline,
+          [ idle_timeout/1
+          , publish_limit/1
+          , mqtt_frame_options/1
+          , mqtt_strict_mode/1
+          , max_packet_size/1
+          , mountpoint/1
+          , use_username_as_clientid/1
+          , stats_timer/1
+          , enable_stats/1
+          , enable_acl/1
+          , enable_ban/1
+          , enable_flapping_detect/1
+          , ignore_loop_deliver/1
+          , server_keepalive/1
+          , keepalive_backoff/1
+          , max_inflight/1
+          , session_expiry_interval/1
+          , force_gc_policy/1
+          , force_shutdown_policy/1
+          ]}).
+
 %% APIs
 -export([start_link/0, stop/0]).
 
--export([ frame_options/1
+%% Zone Option API
+-export([ idle_timeout/1
+        , publish_limit/1
+        , mqtt_frame_options/1
         , mqtt_strict_mode/1
         , max_packet_size/1
+        , mountpoint/1
         , use_username_as_clientid/1
+        , stats_timer/1
         , enable_stats/1
         , enable_acl/1
         , enable_ban/1
         , enable_flapping_detect/1
         , ignore_loop_deliver/1
         , server_keepalive/1
+        , keepalive_backoff/1
         , max_inflight/1
         , session_expiry_interval/1
         , force_gc_policy/1
         , force_shutdown_policy/1
         ]).
 
--export([check_oom/2]).
+-export([ init_gc_state/1
+        , oom_policy/1
+        ]).
 
+%% Zone API
 -export([ get_env/2
         , get_env/3
         , set_env/3
@@ -63,27 +94,46 @@
         , code_change/3
         ]).
 
--export_type([zone/0]).
+-import(emqx_misc, [maybe_apply/2]).
 
-%% dummy state
--record(state, {}).
+-export_type([zone/0]).
 
 -type(zone() :: atom()).
 
 -define(TAB, ?MODULE).
 -define(SERVER, ?MODULE).
+-define(DEFAULT_IDLE_TIMEOUT, 30000).
 -define(KEY(Zone, Key), {?MODULE, Zone, Key}).
 
-%%--------------------------------------------------------------------
-%% APIs
-%%--------------------------------------------------------------------
-
 -spec(start_link() -> startlink_ret()).
 start_link() ->
     gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
 
--spec(frame_options(zone()) -> emqx_frame:options()).
-frame_options(Zone) ->
+-spec(stop() -> ok).
+stop() ->
+    gen_server:stop(?SERVER).
+
+-spec(init_gc_state(zone()) -> emqx_gc:gc_state()).
+init_gc_state(Zone) ->
+    maybe_apply(fun emqx_gc:init/1, force_gc_policy(Zone)).
+
+-spec(oom_policy(zone()) -> emqx_types:oom_policy()).
+oom_policy(Zone) -> force_shutdown_policy(Zone).
+
+%%--------------------------------------------------------------------
+%% Zone Options API
+%%--------------------------------------------------------------------
+
+-spec(idle_timeout(zone()) -> pos_integer()).
+idle_timeout(Zone) ->
+    get_env(Zone, idle_timeout, ?DEFAULT_IDLE_TIMEOUT).
+
+-spec(publish_limit(zone()) -> maybe(esockd_rate_limit:config())).
+publish_limit(Zone) ->
+    get_env(Zone, publish_limit).
+
+-spec(mqtt_frame_options(zone()) -> emqx_frame:options()).
+mqtt_frame_options(Zone) ->
     #{strict_mode => mqtt_strict_mode(Zone),
       max_size    => max_packet_size(Zone)
      }.
@@ -96,10 +146,17 @@ mqtt_strict_mode(Zone) ->
 max_packet_size(Zone) ->
     get_env(Zone, max_packet_size, ?MAX_PACKET_SIZE).
 
+-spec(mountpoint(zone()) -> maybe(emqx_mountpoint:mountpoint())).
+mountpoint(Zone) -> get_env(Zone, mountpoint).
+
 -spec(use_username_as_clientid(zone()) -> boolean()).
 use_username_as_clientid(Zone) ->
     get_env(Zone, use_username_as_clientid, false).
 
+-spec(stats_timer(zone()) -> undefined | disabled).
+stats_timer(Zone) ->
+    case enable_stats(Zone) of true -> undefined; false -> disabled end.
+
 -spec(enable_stats(zone()) -> boolean()).
 enable_stats(Zone) ->
     get_env(Zone, enable_stats, true).
@@ -124,6 +181,10 @@ ignore_loop_deliver(Zone) ->
 server_keepalive(Zone) ->
     get_env(Zone, server_keepalive).
 
+-spec(keepalive_backoff(zone()) -> float()).
+keepalive_backoff(Zone) ->
+    get_env(Zone, keepalive_backoff, 0.75).
+
 -spec(max_inflight(zone()) -> 0..65535).
 max_inflight(Zone) ->
     get_env(Zone, max_inflight, 65535).
@@ -140,18 +201,9 @@ force_gc_policy(Zone) ->
 force_shutdown_policy(Zone) ->
     get_env(Zone, force_shutdown_policy).
 
--spec(check_oom(zone(), fun()) -> ok | term()).
-check_oom(Zone, Action) ->
-    case emqx_zone:force_shutdown_policy(Zone) of
-        undefined -> ok;
-        Policy -> do_check_oom(emqx_oom:init(Policy), Action)
-    end.
-
-do_check_oom(OomPolicy, Action) ->
-    case emqx_oom:check(OomPolicy) of
-        ok -> ok;
-        Shutdown -> Action(Shutdown)
-    end.
+%%--------------------------------------------------------------------
+%% APIs
+%%--------------------------------------------------------------------
 
 -spec(get_env(maybe(zone()), atom()) -> maybe(term())).
 get_env(undefined, Key) -> emqx:get_env(Key);
@@ -179,17 +231,13 @@ unset_env(Zone, Key) ->
 force_reload() ->
     gen_server:call(?SERVER, force_reload).
 
--spec(stop() -> ok).
-stop() ->
-    gen_server:stop(?SERVER, normal, infinity).
-
 %%--------------------------------------------------------------------
 %% gen_server callbacks
 %%--------------------------------------------------------------------
 
 init([]) ->
     _ = do_reload(),
-    {ok, #state{}}.
+    {ok, #{}}.
 
 handle_call(force_reload, _From, State) ->
     _ = do_reload(),