diff --git a/apps/emqx/rebar.config b/apps/emqx/rebar.config
index 3626d0858..9953dd3fc 100644
--- a/apps/emqx/rebar.config
+++ b/apps/emqx/rebar.config
@@ -30,7 +30,7 @@
     {esockd, {git, "https://github.com/emqx/esockd", {tag, "5.11.1"}}},
     {ekka, {git, "https://github.com/emqx/ekka", {tag, "0.18.4"}}},
     {gen_rpc, {git, "https://github.com/emqx/gen_rpc", {tag, "3.3.1"}}},
-    {hocon, {git, "https://github.com/emqx/hocon.git", {tag, "0.40.4"}}},
+    {hocon, {git, "https://github.com/emqx/hocon.git", {tag, "0.41.0"}}},
     {emqx_http_lib, {git, "https://github.com/emqx/emqx_http_lib.git", {tag, "0.5.3"}}},
     {pbkdf2, {git, "https://github.com/emqx/erlang-pbkdf2.git", {tag, "2.0.4"}}},
     {recon, {git, "https://github.com/ferd/recon", {tag, "2.5.1"}}},
diff --git a/apps/emqx_auth/src/emqx_authn/emqx_authn_api.erl b/apps/emqx_auth/src/emqx_authn/emqx_authn_api.erl
index 7f0413fbb..07584c76e 100644
--- a/apps/emqx_auth/src/emqx_authn/emqx_authn_api.erl
+++ b/apps/emqx_auth/src/emqx_authn/emqx_authn_api.erl
@@ -42,7 +42,8 @@
 -export([
     api_spec/0,
     paths/0,
-    schema/1
+    schema/1,
+    namespace/0
 ]).
 
 -export([
@@ -95,6 +96,8 @@
 
 -elvis([{elvis_style, god_modules, disable}]).
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_auth/src/emqx_authz/emqx_authz_api_sources.erl b/apps/emqx_auth/src/emqx_authz/emqx_authz_api_sources.erl
index c2296f129..0af910d18 100644
--- a/apps/emqx_auth/src/emqx_authz/emqx_authz_api_sources.erl
+++ b/apps/emqx_auth/src/emqx_authz/emqx_authz_api_sources.erl
@@ -41,7 +41,8 @@
     api_spec/0,
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 -export([
@@ -56,6 +57,9 @@
 
 -define(TAGS, [<<"Authorization">>]).
 
+namespace() ->
+    undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_auth/src/emqx_authz/emqx_authz_schema.erl b/apps/emqx_auth/src/emqx_authz/emqx_authz_schema.erl
index 426c7a9f6..5a73f5991 100644
--- a/apps/emqx_auth/src/emqx_authz/emqx_authz_schema.erl
+++ b/apps/emqx_auth/src/emqx_authz/emqx_authz_schema.erl
@@ -22,7 +22,8 @@
 -export([
     roots/0,
     fields/1,
-    desc/1
+    desc/1,
+    namespace/0
 ]).
 
 -export([
@@ -65,6 +66,8 @@
 
 roots() -> [].
 
+namespace() -> undefined.
+
 fields(?CONF_NS) ->
     emqx_schema:authz_fields() ++ authz_fields();
 fields("metrics_status_fields") ->
diff --git a/apps/emqx_auth_mnesia/src/emqx_authz_api_mnesia.erl b/apps/emqx_auth_mnesia/src/emqx_authz_api_mnesia.erl
index 5fc1ec280..cab596da3 100644
--- a/apps/emqx_auth_mnesia/src/emqx_authz_api_mnesia.erl
+++ b/apps/emqx_auth_mnesia/src/emqx_authz_api_mnesia.erl
@@ -35,7 +35,8 @@
     api_spec/0,
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 %% operation funs
@@ -69,6 +70,8 @@
 -define(PUT_MAP_EXAMPLE, in_put_requestBody).
 -define(POST_ARRAY_EXAMPLE, in_post_requestBody).
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_bridge/src/schema/emqx_bridge_enterprise.erl b/apps/emqx_bridge/src/schema/emqx_bridge_enterprise.erl
index cc4c6eb01..3822c7a34 100644
--- a/apps/emqx_bridge/src/schema/emqx_bridge_enterprise.erl
+++ b/apps/emqx_bridge/src/schema/emqx_bridge_enterprise.erl
@@ -13,7 +13,8 @@
     examples/1,
     resource_type/1,
     bridge_impl_module/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 api_schemas(Method) ->
@@ -139,6 +140,8 @@ bridge_impl_module(azure_event_hub_producer) ->
 bridge_impl_module(_BridgeType) ->
     undefined.
 
+namespace() -> undefined.
+
 fields(bridges) ->
     [
         {hstreamdb,
diff --git a/apps/emqx_bridge_cassandra/src/emqx_bridge_cassandra_connector.erl b/apps/emqx_bridge_cassandra/src/emqx_bridge_cassandra_connector.erl
index 872ccb532..a84d3912b 100644
--- a/apps/emqx_bridge_cassandra/src/emqx_bridge_cassandra_connector.erl
+++ b/apps/emqx_bridge_cassandra/src/emqx_bridge_cassandra_connector.erl
@@ -14,7 +14,7 @@
 -include_lib("snabbkaffe/include/snabbkaffe.hrl").
 
 %% schema
--export([roots/0, fields/1, desc/1]).
+-export([roots/0, fields/1, desc/1, namespace/0]).
 
 %% callbacks of behaviour emqx_resource
 -export([
@@ -56,6 +56,8 @@
 %%--------------------------------------------------------------------
 %% schema
 
+namespace() -> cassandra.
+
 roots() ->
     [{config, #{type => hoconsc:ref(?MODULE, config)}}].
 
diff --git a/apps/emqx_bridge_clickhouse/src/emqx_bridge_clickhouse.app.src b/apps/emqx_bridge_clickhouse/src/emqx_bridge_clickhouse.app.src
index 85c035be1..3288b83fd 100644
--- a/apps/emqx_bridge_clickhouse/src/emqx_bridge_clickhouse.app.src
+++ b/apps/emqx_bridge_clickhouse/src/emqx_bridge_clickhouse.app.src
@@ -1,6 +1,6 @@
 {application, emqx_bridge_clickhouse, [
     {description, "EMQX Enterprise ClickHouse Bridge"},
-    {vsn, "0.2.4"},
+    {vsn, "0.2.5"},
     {registered, []},
     {applications, [
         kernel,
diff --git a/apps/emqx_bridge_clickhouse/src/emqx_bridge_clickhouse_connector.erl b/apps/emqx_bridge_clickhouse/src/emqx_bridge_clickhouse_connector.erl
index 8f575dd8d..0a6c504c7 100644
--- a/apps/emqx_bridge_clickhouse/src/emqx_bridge_clickhouse_connector.erl
+++ b/apps/emqx_bridge_clickhouse/src/emqx_bridge_clickhouse_connector.erl
@@ -23,7 +23,8 @@
 -export([
     roots/0,
     fields/1,
-    values/1
+    values/1,
+    namespace/0
 ]).
 
 %% callbacks for behaviour emqx_resource
@@ -72,6 +73,8 @@
 %% Configuration and default values
 %%=====================================================================
 
+namespace() -> clickhouse.
+
 roots() ->
     [{config, #{type => hoconsc:ref(?MODULE, config)}}].
 
diff --git a/apps/emqx_bridge_dynamo/src/emqx_bridge_dynamo.app.src b/apps/emqx_bridge_dynamo/src/emqx_bridge_dynamo.app.src
index a4b372056..a0e8e2f19 100644
--- a/apps/emqx_bridge_dynamo/src/emqx_bridge_dynamo.app.src
+++ b/apps/emqx_bridge_dynamo/src/emqx_bridge_dynamo.app.src
@@ -1,6 +1,6 @@
 {application, emqx_bridge_dynamo, [
     {description, "EMQX Enterprise Dynamo Bridge"},
-    {vsn, "0.1.4"},
+    {vsn, "0.1.5"},
     {registered, []},
     {applications, [
         kernel,
diff --git a/apps/emqx_bridge_dynamo/src/emqx_bridge_dynamo_connector.erl b/apps/emqx_bridge_dynamo/src/emqx_bridge_dynamo_connector.erl
index 9cdb8886c..0739df747 100644
--- a/apps/emqx_bridge_dynamo/src/emqx_bridge_dynamo_connector.erl
+++ b/apps/emqx_bridge_dynamo/src/emqx_bridge_dynamo_connector.erl
@@ -12,7 +12,7 @@
 -include_lib("snabbkaffe/include/snabbkaffe.hrl").
 -include_lib("hocon/include/hoconsc.hrl").
 
--export([roots/0, fields/1]).
+-export([roots/0, fields/1, namespace/0]).
 
 %% `emqx_resource' API
 -export([
@@ -32,6 +32,9 @@
 
 %%=====================================================================
 %% Hocon schema
+
+namespace() -> dynamodka.
+
 roots() ->
     [{config, #{type => hoconsc:ref(?MODULE, config)}}].
 
diff --git a/apps/emqx_bridge_rocketmq/src/emqx_bridge_rocketmq.erl b/apps/emqx_bridge_rocketmq/src/emqx_bridge_rocketmq.erl
index 22514dc5c..c40473ee5 100644
--- a/apps/emqx_bridge_rocketmq/src/emqx_bridge_rocketmq.erl
+++ b/apps/emqx_bridge_rocketmq/src/emqx_bridge_rocketmq.erl
@@ -115,7 +115,8 @@ action_values() ->
 
 %% -------------------------------------------------------------------------------------------------
 %% Hocon Schema Definitions
-namespace() -> "bridge_rocketmq".
+
+namespace() -> "rocketmq".
 
 roots() -> [].
 
diff --git a/apps/emqx_bridge_rocketmq/src/emqx_bridge_rocketmq_connector.erl b/apps/emqx_bridge_rocketmq/src/emqx_bridge_rocketmq_connector.erl
index c9a7ce177..a5bfa6437 100644
--- a/apps/emqx_bridge_rocketmq/src/emqx_bridge_rocketmq_connector.erl
+++ b/apps/emqx_bridge_rocketmq/src/emqx_bridge_rocketmq_connector.erl
@@ -12,7 +12,7 @@
 -include_lib("snabbkaffe/include/snabbkaffe.hrl").
 -include_lib("hocon/include/hoconsc.hrl").
 
--export([roots/0, fields/1]).
+-export([roots/0, fields/1, namespace/0]).
 
 %% `emqx_resource' API
 -export([
@@ -36,6 +36,9 @@
 
 %%=====================================================================
 %% Hocon schema
+
+namespace() -> rocketmq.
+
 roots() ->
     [{config, #{type => hoconsc:ref(?MODULE, config)}}].
 
diff --git a/apps/emqx_bridge_sqlserver/src/emqx_bridge_sqlserver.app.src b/apps/emqx_bridge_sqlserver/src/emqx_bridge_sqlserver.app.src
index 331f9c29f..bddf212e3 100644
--- a/apps/emqx_bridge_sqlserver/src/emqx_bridge_sqlserver.app.src
+++ b/apps/emqx_bridge_sqlserver/src/emqx_bridge_sqlserver.app.src
@@ -1,6 +1,6 @@
 {application, emqx_bridge_sqlserver, [
     {description, "EMQX Enterprise SQL Server Bridge"},
-    {vsn, "0.1.5"},
+    {vsn, "0.1.6"},
     {registered, []},
     {applications, [kernel, stdlib, emqx_resource, odbc]},
     {env, []},
diff --git a/apps/emqx_bridge_sqlserver/src/emqx_bridge_sqlserver_connector.erl b/apps/emqx_bridge_sqlserver/src/emqx_bridge_sqlserver_connector.erl
index a87e71e31..e9e77ba6b 100644
--- a/apps/emqx_bridge_sqlserver/src/emqx_bridge_sqlserver_connector.erl
+++ b/apps/emqx_bridge_sqlserver/src/emqx_bridge_sqlserver_connector.erl
@@ -24,7 +24,8 @@
 %% Hocon config schema exports
 -export([
     roots/0,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 %% callbacks for behaviour emqx_resource
@@ -132,6 +133,8 @@
 %% Configuration and default values
 %%====================================================================
 
+namespace() -> sqlserver.
+
 roots() ->
     [{config, #{type => hoconsc:ref(?MODULE, config)}}].
 
diff --git a/apps/emqx_conf/src/emqx_conf.erl b/apps/emqx_conf/src/emqx_conf.erl
index 0a8339ddd..0df5711e0 100644
--- a/apps/emqx_conf/src/emqx_conf.erl
+++ b/apps/emqx_conf/src/emqx_conf.erl
@@ -158,7 +158,6 @@ dump_schema(Dir, SchemaModule) ->
     ok = emqx_dashboard_desc_cache:init(),
     lists:foreach(
         fun(Lang) ->
-            ok = gen_config_md(Dir, SchemaModule, Lang),
             ok = gen_schema_json(Dir, SchemaModule, Lang)
         end,
         ["en", "zh"]
@@ -468,14 +467,6 @@ bridge_schema_json() ->
     SchemaInfo = #{title => <<"EMQX Data Bridge API Schema">>, version => Version},
     gen_api_schema_json_iodata(emqx_bridge_api, SchemaInfo).
 
-%% TODO: remove it and also remove hocon_md.erl and friends.
-%% markdown generation from schema is a failure and we are moving to an interactive
-%% viewer like swagger UI.
-gen_config_md(Dir, SchemaModule, Lang) ->
-    SchemaMdFile = filename:join([Dir, "config-" ++ Lang ++ ".md"]),
-    io:format(user, "===< Generating: ~s~n", [SchemaMdFile]),
-    ok = gen_doc(SchemaMdFile, SchemaModule, Lang).
-
 %% @doc return the root schema module.
 -spec schema_module() -> module().
 schema_module() ->
@@ -515,19 +506,6 @@ make_desc_resolver(Lang) ->
             unicode:characters_to_binary(Desc)
     end.
 
--spec gen_doc(file:name_all(), module(), string()) -> ok.
-gen_doc(File, SchemaModule, Lang) ->
-    Version = emqx_release:version(),
-    Title =
-        "# " ++ emqx_release:description() ++ " Configuration\n\n" ++
-            "<!--" ++ Version ++ "-->",
-    BodyFile = filename:join([rel, "emqx_conf.template." ++ Lang ++ ".md"]),
-    {ok, Body} = file:read_file(BodyFile),
-    Resolver = make_desc_resolver(Lang),
-    Opts = #{title => Title, body => Body, desc_resolver => Resolver},
-    Doc = hocon_schema_md:gen(SchemaModule, Opts),
-    file:write_file(File, Doc).
-
 gen_api_schema_json_iodata(SchemaMod, SchemaInfo) ->
     emqx_dashboard_swagger:gen_api_schema_json_iodata(
         SchemaMod,
diff --git a/apps/emqx_connector/src/emqx_connector_schema_lib.erl b/apps/emqx_connector/src/emqx_connector_schema_lib.erl
index 76a06cb5a..609ba892d 100644
--- a/apps/emqx_connector/src/emqx_connector_schema_lib.erl
+++ b/apps/emqx_connector/src/emqx_connector_schema_lib.erl
@@ -44,12 +44,6 @@
     password/0
 ]).
 
--export([roots/0, fields/1]).
-
-roots() -> [].
-
-fields(_) -> [].
-
 ssl_fields() ->
     [
         {ssl, #{
diff --git a/apps/emqx_connector/src/schema/emqx_connector_ee_schema.erl b/apps/emqx_connector/src/schema/emqx_connector_ee_schema.erl
index f8800cc10..c0b0c365a 100644
--- a/apps/emqx_connector/src/schema/emqx_connector_ee_schema.erl
+++ b/apps/emqx_connector/src/schema/emqx_connector_ee_schema.erl
@@ -15,8 +15,8 @@
 -export([
     api_schemas/1,
     fields/1,
-    %%examples/1
-    schema_modules/0
+    schema_modules/0,
+    namespace/0
 ]).
 
 resource_type(Type) when is_binary(Type) ->
@@ -93,6 +93,8 @@ connector_impl_module(rabbitmq) ->
 connector_impl_module(_ConnectorType) ->
     undefined.
 
+namespace() -> undefined.
+
 fields(connectors) ->
     connector_structs().
 
diff --git a/apps/emqx_dashboard/src/emqx_dashboard_monitor_api.erl b/apps/emqx_dashboard/src/emqx_dashboard_monitor_api.erl
index c36c6d0f3..97397056d 100644
--- a/apps/emqx_dashboard/src/emqx_dashboard_monitor_api.erl
+++ b/apps/emqx_dashboard/src/emqx_dashboard_monitor_api.erl
@@ -27,7 +27,8 @@
 -export([
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 -export([
@@ -35,6 +36,8 @@
     monitor_current/2
 ]).
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true, translate_body => true}).
 
diff --git a/apps/emqx_dashboard/test/emqx_swagger_parameter_SUITE.erl b/apps/emqx_dashboard/test/emqx_swagger_parameter_SUITE.erl
index 1e9e24755..d09490cc9 100644
--- a/apps/emqx_dashboard/test/emqx_swagger_parameter_SUITE.erl
+++ b/apps/emqx_dashboard/test/emqx_swagger_parameter_SUITE.erl
@@ -19,7 +19,7 @@
 -behaviour(hocon_schema).
 
 %% API
--export([paths/0, api_spec/0, schema/1, namespace/0, fields/1]).
+-export([paths/0, api_spec/0, schema/1, roots/0, namespace/0, fields/1]).
 -export([init_per_suite/1, end_per_suite/1]).
 -export([t_in_path/1, t_in_query/1, t_in_mix/1, t_without_in/1, t_ref/1, t_public_ref/1]).
 -export([t_require/1, t_query_enum/1, t_nullable/1, t_method/1, t_api_spec/1]).
@@ -563,6 +563,7 @@ schema("/method/error") ->
     #{operationId => test, bar => #{200 => <<"ok">>}}.
 
 namespace() -> undefined.
+roots() -> [].
 
 fields(page) ->
     [
diff --git a/apps/emqx_dashboard/test/emqx_swagger_remote_schema.erl b/apps/emqx_dashboard/test/emqx_swagger_remote_schema.erl
index dc9d54260..23573d612 100644
--- a/apps/emqx_dashboard/test/emqx_swagger_remote_schema.erl
+++ b/apps/emqx_dashboard/test/emqx_swagger_remote_schema.erl
@@ -17,9 +17,10 @@
 
 -include_lib("typerefl/include/types.hrl").
 
--export([roots/0, fields/1]).
+-export([namespace/0, roots/0, fields/1]).
 -import(hoconsc, [mk/2]).
 roots() -> ["root"].
+namespace() -> undefined.
 
 fields("root") ->
     [
diff --git a/apps/emqx_dashboard/test/emqx_swagger_requestBody_SUITE.erl b/apps/emqx_dashboard/test/emqx_swagger_requestBody_SUITE.erl
index 0e1264aeb..13754579e 100644
--- a/apps/emqx_dashboard/test/emqx_swagger_requestBody_SUITE.erl
+++ b/apps/emqx_dashboard/test/emqx_swagger_requestBody_SUITE.erl
@@ -813,7 +813,8 @@ to_schema(Body) ->
         post => #{requestBody => Body, responses => #{200 => <<"ok">>}}
     }.
 
-%% Don't warning hocon callback namespace/0 undef.
+roots() -> [].
+
 namespace() -> atom_to_list(?MODULE).
 
 fields(good_ref) ->
diff --git a/apps/emqx_dashboard/test/emqx_swagger_response_SUITE.erl b/apps/emqx_dashboard/test/emqx_swagger_response_SUITE.erl
index 5ccb01b3e..b9d7bf2e4 100644
--- a/apps/emqx_dashboard/test/emqx_swagger_response_SUITE.erl
+++ b/apps/emqx_dashboard/test/emqx_swagger_response_SUITE.erl
@@ -680,6 +680,7 @@ to_schema(Object) ->
         post => #{responses => #{200 => Object, 201 => Object}}
     }.
 
+rotos() -> [].
 namespace() -> undefined.
 
 fields(good_ref) ->
diff --git a/apps/emqx_gateway/src/emqx_gateway_api.erl b/apps/emqx_gateway/src/emqx_gateway_api.erl
index bd0bcff8a..6c125cf22 100644
--- a/apps/emqx_gateway/src/emqx_gateway_api.erl
+++ b/apps/emqx_gateway/src/emqx_gateway_api.erl
@@ -36,7 +36,8 @@
 -export([
     api_spec/0,
     paths/0,
-    schema/1
+    schema/1,
+    namespace/0
 ]).
 
 -export([
@@ -59,6 +60,8 @@
 %% minirest behaviour callbacks
 %%--------------------------------------------------------------------
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_gateway/src/emqx_gateway_api_clients.erl b/apps/emqx_gateway/src/emqx_gateway_api_clients.erl
index 121cb4064..88c53d230 100644
--- a/apps/emqx_gateway/src/emqx_gateway_api_clients.erl
+++ b/apps/emqx_gateway/src/emqx_gateway_api_clients.erl
@@ -42,7 +42,8 @@
 
 -export([
     roots/0,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 %% http handlers
@@ -775,6 +776,8 @@ schema_client() ->
         examples_client()
     ).
 
+namespace() -> undefined.
+
 roots() ->
     [
         stomp_client,
diff --git a/apps/emqx_gateway/src/emqx_gateway_api_listeners.erl b/apps/emqx_gateway/src/emqx_gateway_api_listeners.erl
index 284576983..3072d8903 100644
--- a/apps/emqx_gateway/src/emqx_gateway_api_listeners.erl
+++ b/apps/emqx_gateway/src/emqx_gateway_api_listeners.erl
@@ -45,7 +45,8 @@
 
 -export([
     roots/0,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 %% http handlers
@@ -651,6 +652,9 @@ params_paging_in_qs() ->
 %%--------------------------------------------------------------------
 %% schemas
 
+namespace() ->
+    undefined.
+
 roots() ->
     [listener].
 
diff --git a/apps/emqx_gateway_jt808/src/emqx_jt808_schema.erl b/apps/emqx_gateway_jt808/src/emqx_jt808_schema.erl
index d4b0a0b5e..97b01e5e8 100644
--- a/apps/emqx_gateway_jt808/src/emqx_jt808_schema.erl
+++ b/apps/emqx_gateway_jt808/src/emqx_jt808_schema.erl
@@ -9,10 +9,12 @@
 -include_lib("typerefl/include/types.hrl").
 
 -behaviour(hocon_schema).
--export([namespace/0, fields/1, desc/1]).
+-export([roots/0, namespace/0, fields/1, desc/1]).
 
 -define(NOT_EMPTY(MSG), emqx_resource_validator:not_empty(MSG)).
 
+roots() -> [].
+
 namespace() -> gateway.
 
 fields(jt808) ->
diff --git a/apps/emqx_gcp_device/src/emqx_gcp_device.app.src b/apps/emqx_gcp_device/src/emqx_gcp_device.app.src
index 7f1d81f14..b3a4407c0 100644
--- a/apps/emqx_gcp_device/src/emqx_gcp_device.app.src
+++ b/apps/emqx_gcp_device/src/emqx_gcp_device.app.src
@@ -1,6 +1,6 @@
 {application, emqx_gcp_device, [
     {description, "Application simplifying migration from GCP IoT Core"},
-    {vsn, "0.1.3"},
+    {vsn, "0.1.4"},
     {registered, []},
     {mod, {emqx_gcp_device_app, []}},
     {applications, [
diff --git a/apps/emqx_gcp_device/src/emqx_gcp_device_api.erl b/apps/emqx_gcp_device/src/emqx_gcp_device_api.erl
index a08e0af24..4e10092b8 100644
--- a/apps/emqx_gcp_device/src/emqx_gcp_device_api.erl
+++ b/apps/emqx_gcp_device/src/emqx_gcp_device_api.erl
@@ -22,7 +22,8 @@
     api_spec/0,
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 -export([
@@ -62,6 +63,9 @@
 %% `minirest' and `minirest_trails' API
 %%-------------------------------------------------------------------------------------------------
 
+namespace() ->
+    undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_management/src/emqx_mgmt_api_alarms.erl b/apps/emqx_management/src/emqx_mgmt_api_alarms.erl
index d5965f019..ea88ba082 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_alarms.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_alarms.erl
@@ -22,7 +22,7 @@
 -include_lib("emqx/include/emqx.hrl").
 -include_lib("typerefl/include/types.hrl").
 
--export([api_spec/0, paths/0, schema/1, fields/1]).
+-export([api_spec/0, paths/0, schema/1, fields/1, namespace/0]).
 
 -export([alarms/2, format_alarm/2]).
 
@@ -31,6 +31,9 @@
 %% internal export (for query)
 -export([qs2ms/2]).
 
+namespace() ->
+    undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_management/src/emqx_mgmt_api_banned.erl b/apps/emqx_management/src/emqx_mgmt_api_banned.erl
index cf1ab3c49..4f2ba6c00 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_banned.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_banned.erl
@@ -28,7 +28,8 @@
     api_spec/0,
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 -export([format/1]).
@@ -44,6 +45,9 @@
 
 -define(FORMAT_FUN, {?MODULE, format}).
 
+namespace() ->
+    undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true, translate_body => true}).
 
diff --git a/apps/emqx_management/src/emqx_mgmt_api_clients.erl b/apps/emqx_management/src/emqx_mgmt_api_clients.erl
index 8965f4633..f5c799dd9 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_clients.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_clients.erl
@@ -32,7 +32,8 @@
     api_spec/0,
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 -export([
@@ -83,6 +84,8 @@
     message => <<"Client ID not found">>
 }).
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true, translate_body => true}).
 
diff --git a/apps/emqx_management/src/emqx_mgmt_api_data_backup.erl b/apps/emqx_management/src/emqx_mgmt_api_data_backup.erl
index ef0b095cb..86fc8131d 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_data_backup.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_data_backup.erl
@@ -21,7 +21,7 @@
 -include_lib("emqx/include/logger.hrl").
 -include_lib("hocon/include/hoconsc.hrl").
 
--export([api_spec/0, paths/0, schema/1, fields/1]).
+-export([api_spec/0, paths/0, schema/1, fields/1, namespace/0]).
 
 -export([
     data_export/2,
@@ -48,6 +48,8 @@
         })}
 ).
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_management/src/emqx_mgmt_api_metrics.erl b/apps/emqx_management/src/emqx_mgmt_api_metrics.erl
index 7ad0777c7..a4a27c0f4 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_metrics.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_metrics.erl
@@ -27,7 +27,8 @@
 -export([
     api_spec/0,
     paths/0,
-    schema/1
+    schema/1,
+    namespace/0
 ]).
 
 -export([
@@ -42,6 +43,8 @@
 %% minirest behaviour callbacks
 %%--------------------------------------------------------------------
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_management/src/emqx_mgmt_api_nodes.erl b/apps/emqx_management/src/emqx_mgmt_api_nodes.erl
index 07d775f6e..9e9fad784 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_nodes.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_nodes.erl
@@ -30,7 +30,8 @@
     api_spec/0,
     schema/1,
     paths/0,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 %% API callbacks
@@ -45,6 +46,8 @@
 %% API spec funcs
 %%--------------------------------------------------------------------
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_management/src/emqx_mgmt_api_publish.erl b/apps/emqx_management/src/emqx_mgmt_api_publish.erl
index f0834af96..c8c1a6e10 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_publish.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_publish.erl
@@ -32,7 +32,8 @@
     api_spec/0,
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 -export([
@@ -40,6 +41,8 @@
     publish_batch/2
 ]).
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true, translate_body => true}).
 
diff --git a/apps/emqx_management/src/emqx_mgmt_api_stats.erl b/apps/emqx_management/src/emqx_mgmt_api_stats.erl
index cddc2a7c3..cb07be6d2 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_stats.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_stats.erl
@@ -34,11 +34,14 @@
     api_spec/0,
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 -export([list/2]).
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl b/apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl
index ca0a7a625..39dc639d5 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_subscriptions.erl
@@ -28,7 +28,8 @@
     api_spec/0,
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 -export([subscriptions/2]).
@@ -48,6 +49,9 @@
     {<<"match_topic">>, binary}
 ]).
 
+namespace() ->
+    undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_management/src/emqx_mgmt_api_topics.erl b/apps/emqx_management/src/emqx_mgmt_api_topics.erl
index 02d4461e9..bffcc2f0c 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_topics.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_topics.erl
@@ -28,7 +28,8 @@
     api_spec/0,
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 -export([
@@ -41,6 +42,8 @@
 -define(TOPICS_QUERY_SCHEMA, [{<<"topic">>, binary}, {<<"node">>, atom}]).
 -define(TAGS, [<<"Topics">>]).
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true, translate_body => true}).
 
diff --git a/apps/emqx_modules/src/emqx_delayed_api.erl b/apps/emqx_modules/src/emqx_delayed_api.erl
index f6ea99c12..37a79d8e0 100644
--- a/apps/emqx_modules/src/emqx_delayed_api.erl
+++ b/apps/emqx_modules/src/emqx_delayed_api.erl
@@ -34,7 +34,8 @@
 -export([
     paths/0,
     fields/1,
-    schema/1
+    schema/1,
+    namespace/0
 ]).
 
 %% for rpc
@@ -55,6 +56,8 @@
 -define(INVALID_TOPIC, 'INVALID_TOPIC_NAME').
 -define(MESSAGE_NOT_FOUND, 'MESSAGE_NOT_FOUND').
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_modules/src/emqx_topic_metrics_api.erl b/apps/emqx_modules/src/emqx_topic_metrics_api.erl
index 49b3071e0..982a4e710 100644
--- a/apps/emqx_modules/src/emqx_topic_metrics_api.erl
+++ b/apps/emqx_modules/src/emqx_topic_metrics_api.erl
@@ -47,7 +47,8 @@
     api_spec/0,
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 -define(EXCEED_LIMIT, 'EXCEED_LIMIT').
@@ -55,6 +56,8 @@
 -define(TOPIC_NOT_FOUND, 'TOPIC_NOT_FOUND').
 -define(BAD_REQUEST, 'BAD_REQUEST').
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_mysql/src/emqx_mysql.erl b/apps/emqx_mysql/src/emqx_mysql.erl
index d33f313bc..cf937aeba 100644
--- a/apps/emqx_mysql/src/emqx_mysql.erl
+++ b/apps/emqx_mysql/src/emqx_mysql.erl
@@ -44,7 +44,7 @@
     unprepare_sql/1
 ]).
 
--export([roots/0, fields/1]).
+-export([roots/0, fields/1, namespace/0]).
 
 -export([do_get_status/1]).
 
@@ -63,6 +63,9 @@
 -export_type([state/0]).
 %%=====================================================================
 %% Hocon schema
+
+namespace() -> mysql.
+
 roots() ->
     [{config, #{type => hoconsc:ref(?MODULE, config)}}].
 
diff --git a/apps/emqx_oracle/src/emqx_oracle_schema.erl b/apps/emqx_oracle/src/emqx_oracle_schema.erl
index ba9904f19..a30ffca92 100644
--- a/apps/emqx_oracle/src/emqx_oracle_schema.erl
+++ b/apps/emqx_oracle/src/emqx_oracle_schema.erl
@@ -12,9 +12,12 @@
 %% Hocon config schema exports
 -export([
     roots/0,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
+namespace() -> oracle.
+
 roots() ->
     [{config, #{type => hoconsc:ref(?REF_MODULE, config)}}].
 
diff --git a/apps/emqx_postgresql/src/emqx_postgresql.erl b/apps/emqx_postgresql/src/emqx_postgresql.erl
index e77a88c57..c8f354df0 100644
--- a/apps/emqx_postgresql/src/emqx_postgresql.erl
+++ b/apps/emqx_postgresql/src/emqx_postgresql.erl
@@ -23,7 +23,7 @@
 -include_lib("epgsql/include/epgsql.hrl").
 -include_lib("snabbkaffe/include/snabbkaffe.hrl").
 
--export([roots/0, fields/1]).
+-export([roots/0, fields/1, namespace/0]).
 
 -behaviour(emqx_resource).
 
@@ -71,6 +71,8 @@
 
 %%=====================================================================
 
+namespace() -> postgres.
+
 roots() ->
     [{config, #{type => hoconsc:ref(?MODULE, config)}}].
 
diff --git a/apps/emqx_prometheus/src/emqx_prometheus_api.erl b/apps/emqx_prometheus/src/emqx_prometheus_api.erl
index 89bfa6e6a..432142775 100644
--- a/apps/emqx_prometheus/src/emqx_prometheus_api.erl
+++ b/apps/emqx_prometheus/src/emqx_prometheus_api.erl
@@ -34,7 +34,8 @@
     api_spec/0,
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 -export([
@@ -50,6 +51,8 @@
 -define(IS_TRUE(Val), ((Val =:= true) orelse (Val =:= <<"true">>))).
 -define(IS_FALSE(Val), ((Val =:= false) orelse (Val =:= <<"false">>))).
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/apps/emqx_telemetry/src/emqx_telemetry_api.erl b/apps/emqx_telemetry/src/emqx_telemetry_api.erl
index c90ad6b38..da18f761a 100644
--- a/apps/emqx_telemetry/src/emqx_telemetry_api.erl
+++ b/apps/emqx_telemetry/src/emqx_telemetry_api.erl
@@ -32,12 +32,15 @@
     api_spec/0,
     paths/0,
     schema/1,
-    fields/1
+    fields/1,
+    namespace/0
 ]).
 
 -define(BAD_REQUEST, 'BAD_REQUEST').
 -define(NOT_FOUND, 'NOT_FOUND').
 
+namespace() -> undefined.
+
 api_spec() ->
     emqx_dashboard_swagger:spec(?MODULE, #{check_schema => true}).
 
diff --git a/changes/ce/feat-12517.en.md b/changes/ce/feat-12517.en.md
new file mode 100644
index 000000000..b26e3edc8
--- /dev/null
+++ b/changes/ce/feat-12517.en.md
@@ -0,0 +1,15 @@
+Congifuration files now support multi-line string values with indentation.
+
+Introduced the `"""~` and `~"""` to quote indented lines. For example:
+
+```
+rule_xlu4 {
+  sql = """~
+    SELECT
+      *
+    FROM
+      "t/#"
+  ~"""
+}
+```
+See [HOCON 0.41.0](https://github.com/emqx/hocon/releases/tag/0.41.0) release note for more dtails.
diff --git a/mix.exs b/mix.exs
index b40ca2168..abbf5940c 100644
--- a/mix.exs
+++ b/mix.exs
@@ -72,7 +72,7 @@ defmodule EMQXUmbrella.MixProject do
       # in conflict by emqtt and hocon
       {:getopt, "1.0.2", override: true},
       {:snabbkaffe, github: "kafka4beam/snabbkaffe", tag: "1.0.8", override: true},
-      {:hocon, github: "emqx/hocon", tag: "0.40.4", override: true},
+      {:hocon, github: "emqx/hocon", tag: "0.41.0", override: true},
       {:emqx_http_lib, github: "emqx/emqx_http_lib", tag: "0.5.3", override: true},
       {:esasl, github: "emqx/esasl", tag: "0.2.0"},
       {:jose, github: "potatosalad/erlang-jose", tag: "1.11.2"},
diff --git a/rebar.config b/rebar.config
index 5ebe9da15..88b32483e 100644
--- a/rebar.config
+++ b/rebar.config
@@ -97,7 +97,7 @@
     {system_monitor, {git, "https://github.com/ieQu1/system_monitor", {tag, "3.0.3"}}},
     {getopt, "1.0.2"},
     {snabbkaffe, {git, "https://github.com/kafka4beam/snabbkaffe.git", {tag, "1.0.8"}}},
-    {hocon, {git, "https://github.com/emqx/hocon.git", {tag, "0.40.4"}}},
+    {hocon, {git, "https://github.com/emqx/hocon.git", {tag, "0.41.0"}}},
     {emqx_http_lib, {git, "https://github.com/emqx/emqx_http_lib.git", {tag, "0.5.3"}}},
     {esasl, {git, "https://github.com/emqx/esasl", {tag, "0.2.0"}}},
     {jose, {git, "https://github.com/potatosalad/erlang-jose", {tag, "1.11.2"}}},
diff --git a/rel/emqx_conf.template.en.md b/rel/emqx_conf.template.en.md
deleted file mode 100644
index 2dcb83896..000000000
--- a/rel/emqx_conf.template.en.md
+++ /dev/null
@@ -1,329 +0,0 @@
-EMQX configuration files are in [HOCON](https://github.com/emqx/hocon) format.
-HOCON, or Human-Optimized Config Object Notation is a format for human-readable data,
-and a superset of JSON.
-
-## Layered
-
-EMQX configuration consists of two layers.
-From bottom up:
-
-1. Cluster-synced configs: `$EMQX_NODE__DATA_DIR/configs/cluster.hocon`.
-2. Local node configs: `emqx.conf` + `EMQX_` prefixed environment variables.
-
-:::tip Tip
-Prior to v5.0.23 and e5.0.3, the cluster-synced configs are stored in
-`cluster-override.conf` which is applied on top of the local configs.
-
-If upgraded from an earlier version, as long as `cluster-override.conf` exists,
-`cluster.hocon` will not be created, and `cluster-override.conf` will stay on
-top of the overriding layers.
-:::
-
-When environment variable `$EMQX_NODE__DATA_DIR` is not set, config `node.data_dir`
-is used.
-
-The `cluster.hocon` file is overwritten at runtime when changes
-are made from Dashboard, management HTTP API, or CLI. When clustered,
-after EMQX restarts, it copies the file from the node which has the greatest `uptime`.
-
-:::tip Tip
-To avoid confusion, don't add the same keys in both `cluster.hocon` and `emqx.conf`.
-:::
-
-For detailed override rules, see [Config Overlay Rules](#config-overlay-rules).
-
-## Syntax
-
-In config file the values can be notated as JSON like objects, such as
-```
-node {
-    name = "emqx@127.0.0.1"
-    cookie = "mysecret"
-}
-```
-
-Another equivalent representation is flat, such as
-
-```
-node.name = "127.0.0.1"
-node.cookie = "mysecret"
-```
-
-This flat format is almost backward compatible with EMQX's config file format
-in 4.x series (the so called 'cuttlefish' format).
-
-It is not fully compatible because the often HOCON requires strings to be quoted,
-while cuttlefish treats all characters to the right of the `=` mark as the value.
-
-e.g. cuttlefish: `node.name = emqx@127.0.0.1`, HOCON: `node.name = "emqx@127.0.0.1"`.
-
-Strings without special characters in them can be unquoted in HOCON too,
-e.g. `foo`, `foo_bar` and `foo_bar_1`.
-
-For more HOCON syntax, please refer to the [specification](https://github.com/lightbend/config/blob/main/HOCON.md)
-
-## Schema
-
-To make the HOCON objects type-safe, EMQX introduced a schema for it.
-The schema defines data types, and data fields' names and metadata for config value validation
-and more.
-
-::: tip Tip
-The configuration document you are reading now is generated from schema metadata.
-:::
-
-### Complex Data Types
-
-There are 4 complex data types in EMQX's HOCON config:
-
-1. Struct: Named using an unquoted string, followed by a predefined list of fields.
-   Only lowercase letters and digits are allowed in struct and field names.
-   Alos, only underscore can be used as word separator.
-1. Map: Map is like Struct, however the fields are not predefined.
-1. Union: `MemberType1 | MemberType2 | ...`
-1. Array: `[ElementType]`
-
-::: tip Tip
-If map field name is a positive integer number, it is interpreted as an alternative representation of an `Array`.
-For example:
-```
-myarray.1 = 74
-myarray.2 = 75
-```
-will be interpreated as `myarray = [74, 75]`, which is handy when trying to override array elements.
-:::
-
-### Primitive Data Types
-
-Complex types define data 'boxes' which may contain other complex data
-or primitive values.
-There are quite some different primitive types, to name a few:
-
-* `atom()`.
-* `boolean()`.
-* `string()`.
-* `integer()`.
-* `float()`.
-* `number()`.
-* `binary()`, another format of string().
-* `emqx_schema:duration()`, time duration, another format of integer()
-* ...
-
-::: tip Tip
-The primitive types are mostly self-describing, so there is usually not a lot to document.
-For types that are not so clear by their names, the field description is to be used to find the details.
-:::
-
-### Config Paths
-
-If we consider the whole EMQX config as a tree,
-to reference a primitive value, we can use a dot-separated names form string for
-the path from the tree-root (always a Struct) down to the primitive values at tree-leaves.
-
-Each segment of the dotted string is a Struct field name or Map key.
-For Array elements, 1-based index is used.
-
-below are some examples
-
-```
-node.name = "emqx.127.0.0.1"
-zone.zone1.max_packet_size = "10M"
-authentication.1.enable = true
-```
-
-### Environment variables
-
-Environment variables can be used to define or override config values.
-
-Due to the fact that dots (`.`) are not allowed in environment variables, dots are
-replaced with double-underscores (`__`).
-
-And the `EMQX_` prefix is used as the namespace.
-
-For example `node.name` can be represented as `EMQX_NODE__NAME`
-
-Environment variable values are parsed as HOCON values, this allows users
-to even set complex values from environment variables.
-
-For example, this environment variable sets an array value.
-
-```
-export EMQX_LISTENERS__SSL__L1__AUTHENTICATION__SSL__CIPHERS='["TLS_AES_256_GCM_SHA384"]'
-```
-However, this also means a string value should be quoted if it happens to contain special
-characters such as `=` and `:`.
-
-For example, a string value `"localhost:1883"` would be
-parsed into object (struct): `{"localhost": 1883}`.
-
-To keep it as a string, one should quote the value like below:
-
-```
-EMQX_BRIDGES__MQTT__MYBRIDGE__CONNECTOR_SERVER='"localhost:1883"'
-```
-
-::: tip Tip
-Unknown root paths are silently discarded by EMQX, for example `EMQX_UNKNOWN_ROOT__FOOBAR` is
-silently discarded because `unknown_root` is not a predefined root path.
-
-Unknown field names in environment variables are logged as a `warning` level log, for example:
-
-```
-[warning] unknown_env_vars: ["EMQX_AUTHENTICATION__ENABLED"]
-```
-
-because the field name is `enable`, not `enabled`.
-:::
-
-
-### Config Overlay Rules
-
-HOCON objects are overlaid, in general:
-
-- Within one file, objects defined 'later' recursively override objects defined 'earlier'
-- When layered, 'later' (higher layer) objects override objects defined 'earlier' (lower layer)
-
-Below are more detailed rules.
-
-#### Struct Fields
-
-Later config values overwrites earlier values.
-For example, in below config, the last line `debug` overwrites `error` for
-console log handler's `level` config, but leaving `enable` unchanged.
-```
-log {
-    console_handler{
-        enable=true,
-        level=error
-    }
-}
-
-## ... more configs ...
-
-log.console_handler.level=debug
-```
-
-#### Map Values
-
-Maps are like structs, only the files are user-defined rather than
-the config schema. For instance, `zone1` in the example below.
-
-```
-zone {
-    zone1 {
-        mqtt.max_packet_size = 1M
-    }
-}
-
-## The maximum packet size can be defined as above,
-## then overridden as below
-
-zone.zone1.mqtt.max_packet_size = 10M
-```
-
-#### Array Elements
-
-Arrays in EMQX config have two different representations
-
-* list, such as: `[1, 2, 3]`
-* indexed-map, such as: `{"1"=1, "2"=2, "3"=3}`
-
-Dot-separated paths with number in it are parsed to indexed-maps
-e.g. `authentication.1={...}` is parsed as `authentication={"1": {...}}`
-
-This feature makes it easy to override array element values. For example:
-
-```
-authentication=[{enable=true, backend="built_in_database", mechanism="password_based"}]
-# we can disable this authentication provider with:
-authentication.1.enable=false
-```
-
-::: warning Warning
-List arrays is a full-array override, but not a recursive merge, into indexed-map arrays.
-e.g.
-
-```
-authentication=[{enable=true, backend="built_in_database", mechanism="password_based"}]
-## below value will replace the whole array, but not to override just one field.
-authentication=[{enable=true}]
-```
-:::
-
-#### TLS/SSL ciphers
-
-Starting from v5.0.6, EMQX no longer pre-populates the ciphers list with a default
-set of cipher suite names.
-Instead, the default ciphers are applied at runtime when starting the listener
-for servers, or when establishing a TLS connection as a client.
-
-Below are the default ciphers selected by EMQX.
-
-For tlsv1.3:
-```
-ciphers =
-  [ "TLS_AES_256_GCM_SHA384", "TLS_AES_128_GCM_SHA256",
-    "TLS_CHACHA20_POLY1305_SHA256", "TLS_AES_128_CCM_SHA256",
-    "TLS_AES_128_CCM_8_SHA256"
-  ]
-```
-
-For tlsv1.2 or earlier
-
-```
-ciphers =
-  [ "ECDHE-ECDSA-AES256-GCM-SHA384",
-    "ECDHE-RSA-AES256-GCM-SHA384",
-    "ECDHE-ECDSA-AES256-SHA384",
-    "ECDHE-RSA-AES256-SHA384",
-    "ECDH-ECDSA-AES256-GCM-SHA384",
-    "ECDH-RSA-AES256-GCM-SHA384",
-    "ECDH-ECDSA-AES256-SHA384",
-    "ECDH-RSA-AES256-SHA384",
-    "DHE-DSS-AES256-GCM-SHA384",
-    "DHE-DSS-AES256-SHA256",
-    "AES256-GCM-SHA384",
-    "AES256-SHA256",
-    "ECDHE-ECDSA-AES128-GCM-SHA256",
-    "ECDHE-RSA-AES128-GCM-SHA256",
-    "ECDHE-ECDSA-AES128-SHA256",
-    "ECDHE-RSA-AES128-SHA256",
-    "ECDH-ECDSA-AES128-GCM-SHA256",
-    "ECDH-RSA-AES128-GCM-SHA256",
-    "ECDH-ECDSA-AES128-SHA256",
-    "ECDH-RSA-AES128-SHA256",
-    "DHE-DSS-AES128-GCM-SHA256",
-    "DHE-DSS-AES128-SHA256",
-    "AES128-GCM-SHA256",
-    "AES128-SHA256",
-    "ECDHE-ECDSA-AES256-SHA",
-    "ECDHE-RSA-AES256-SHA",
-    "DHE-DSS-AES256-SHA",
-    "ECDH-ECDSA-AES256-SHA",
-    "ECDH-RSA-AES256-SHA",
-    "ECDHE-ECDSA-AES128-SHA",
-    "ECDHE-RSA-AES128-SHA",
-    "DHE-DSS-AES128-SHA",
-    "ECDH-ECDSA-AES128-SHA",
-    "ECDH-RSA-AES128-SHA"
-  ]
-```
-
-For PSK enabled listeners
-
-```
-ciphers =
-  [ "RSA-PSK-AES256-GCM-SHA384",
-    "RSA-PSK-AES256-CBC-SHA384",
-    "RSA-PSK-AES128-GCM-SHA256",
-    "RSA-PSK-AES128-CBC-SHA256",
-    "RSA-PSK-AES256-CBC-SHA",
-    "RSA-PSK-AES128-CBC-SHA",
-    "PSK-AES256-GCM-SHA384",
-    "PSK-AES128-GCM-SHA256",
-    "PSK-AES256-CBC-SHA384",
-    "PSK-AES256-CBC-SHA",
-    "PSK-AES128-CBC-SHA256",
-    "PSK-AES128-CBC-SHA"
-  ]
-```
diff --git a/rel/emqx_conf.template.zh.md b/rel/emqx_conf.template.zh.md
deleted file mode 100644
index a9df27f63..000000000
--- a/rel/emqx_conf.template.zh.md
+++ /dev/null
@@ -1,306 +0,0 @@
-EMQX的配置文件格式是 [HOCON](https://github.com/emqx/hocon) 。
-HOCON（Human-Optimized Config Object Notation）是一个JSON的超集，非常适用于易于人类读写的配置数据存储。
-
-## 分层结构
-
-EMQX的配置文件可分为二层，自底向上依次是：
-
-1. 集群同步配置：`$EMQX_NODE__DATA_DIR/configs/cluster.hocon`。
-2. 本地节点配置：`emqx.conf` 加上 `EMQX_` 前缀的环境变量。
-
-:::tip Tip
-在 v5.0.23 或 e5.0.3 之前，集群同步配置保存在文件 `cluster-override.conf` 中，并且它覆盖在配置的最上层。
-
-如果从之前的版本升级上来，只要 `cluster-override.conf` 文件存在，
-EMQX 就不会创建 `cluster.hocon`，并且 `cluster-override.conf` 会继续覆盖在配置的最上层。
-:::
-
-如果环境变量 `$EMQX_NODE__DATA_DIR` 没有设置，那么该目录会从 `emqx.conf` 的 `node.data_dir` 配置中读取。
-
-配置文件 `cluster.hocon` 的内容会在运行时被EMQX重写。
-这些重写发生在 dashboard UI，管理HTTP API，或者CLI对集群配置进行修改时。
-当EMQX运行在集群中时，一个EMQX节点重启之后，会从集群中其他节点复制该文件内容到本地。
-
-:::tip Tip
-为避免歧义，应尽量避免让 `cluster.hocon` 和 `emqx.conf` 出现配置交集。
-:::
-
-更多的重载规则，请参考下文 [配置重载规则](#配置重载规则)。
-
-## 配置文件语法
-
-在配置文件中，值可以被记为类似JSON的对象，例如
-
-```
-node {
-    name = "emqx@127.0.0.1"
-    cookie = "mysecret"
-}
-```
-
-另一种等价的表示方法是扁平的，例如
-
-```
-node.name = "127.0.0.1"
-node.cookie = "mysecret"
-```
-
-这种扁平格式几乎与EMQX的配置文件格式向后兼容
-在4.x系列中（所谓的'cuttlefish'格式）。
-
-它并不是完全兼容，因为HOCON经常要求字符串两端加上引号。
-而cuttlefish把`=`符右边的所有字符都视为值。
-
-例如，cuttlefish：`node.name = emqx@127.0.0.1`，HOCON：`node.name = "emqx@127.0.0.1"`。
-
-没有特殊字符的字符串在HOCON中也可以不加引号。
-例如：`foo`，`foo_bar`和`foo_bar_1`。
-
-关于更多的HOCON语法，请参考[规范](https://github.com/lightbend/config/blob/main/HOCON.md)
-
-## Schema
-
-为了使HOCON对象类型安全，EMQX为它引入了一个schema。
-该schema定义了数据类型，以及数据字段的名称和元数据，用于配置值的类型检查等等。
-
-::: tip Tip
-当前阅读到配置文件的文档本身就是由模式元数据生成的。
-:::
-
-### 复杂数据类型
-
-EMQX的配置文件中，有4中复杂数据结构类型，它们分别是：
-
-1. Struct：结构体都是有类型名称的，结构体中可以有任意多个字段。
-   结构体和字段的名称由不带特殊字符的全小些字母组成，名称中可以带数字，但不得以数字开头，多个单词可用下划线分隔。
-1. Map: Map 与 Struct（结构体）类似，但是内部的字段不是预先定义好的。
-1. Union: 联合 `MemberType1 | MemberType2 | ...`，可以理解为：“不是这个，就是那个”
-1. Array: 数组 `[ElementType]`
-
-::: tip Tip
-如果Map的字段名称是纯数字，它会被解释成一个数组。
-例如
-```
-myarray.1 = 74
-myarray.2 = 75
-```
-会被解析成 `myarray = [74, 75]`。这个用法在重载数组元素的值时候非常有用。
-:::
-
-### 原始数据类型
-
-复杂类型定义了数据 "盒子"，其中可能包含其他复杂数据或原始值。
-有很多不同的原始类型，仅举几个例子。
-
-* 原子 `atom()`。
-* 布尔 `boolean()`。
-* 字符串 `string()`。
-* 整形 `integer()`。
-* 浮点数 `float()`。
-* 数值 `number()`。
-* 二进制编码的字符串 `binary()` 是 `string()` 的另一种格式。
-* 时间间隔 `emqx_schema:duration()` 是 `integer()` 的另一种格式。
-* ...
-
-::: tip Tip
-原始类型的名称大多是自我描述的，所以不需要过多的注释。
-但是有一些不是那么直观的数据类型，则需要配合字段的描述文档进行理解。
-:::
-
-
-### 配置路径
-
-如果我们把EMQX的配置值理解成一个类似目录树的结构，那么类似于文件系统中使用斜杠或反斜杠进行层级分割，
-EMQX使用的配置路径的层级分割符是 `'.'`
-
-被 `'.'` 号分割的每一段，则是 Struct（结构体）的字段，或 Map 的 key。
-
-下面有几个例子：
-
-```
-node.name = "emqx.127.0.0.1"
-zone.zone1.max_packet_size = "10M"
-authentication.1.enable = true
-```
-
-### 环境变量重载
-
-因为 `'.'`  分隔符不能使用于环境变量，所以我们需要使用另一个分割符。EMQX选用的是双下划线 `__`。
-为了与其他的环境变量有所区分，EMQX还增加了一个前缀 `EMQX_` 来用作环境变量命名空间。
-
-例如 `node.name` 的重载变量名是 `EMQX_NODE__NAME`。
-
-环境变量的值，是按 HOCON 值解析的，这也使得环境变量可以用来传递复杂数据类型的值。
-
-例如，下面这个环境变量传入一个数组类型的值。
-
-```
-export EMQX_LISTENERS__SSL__L1__AUTHENTICATION__SSL__CIPHERS='["TLS_AES_256_GCM_SHA384"]'
-```
-
-这也意味着有些带特殊字符（例如`:` 和 `=`），则需要用双引号对这个值包起来。
-
-例如`localhost:1883` 会被解析成一个结构体 `{"localhost": 1883}`。
-想要把它当字符串使用时，就必需使用引号，如下：
-
-```
-EMQX_BRIDGES__MQTT__MYBRIDGE__CONNECTOR_SERVER='"localhost:1883"'
-```
-
-
-::: tip Tip
-未定义的根路径会被EMQX忽略，例如 `EMQX_UNKNOWN_ROOT__FOOBAR` 这个环境变量会被EMQX忽略，
-因为 `UNKNOWN_ROOT` 不是预先定义好的根路径。
-对于已知的根路径，未知的字段名称将被记录为warning日志，比如下面这个例子。
-
-```
-[warning] unknown_env_vars: ["EMQX_AUTHENTICATION__ENABLED"]
-```
-
-这是因为正确的字段名称是 `enable`，而不是 `enabled`。
-:::
-
-### 配置重载规则
-
-HOCON的值是分层覆盖的，普遍规则如下：
-
-- 在同一个文件中，后（在文件底部）定义的值，覆盖前（在文件顶部）到值。
-- 当按层级覆盖时，高层级的值覆盖低层级的值。
-
-结下来的文档将解释更详细的规则。
-
-#### 结构体
-
-合并覆盖规则。在如下配置中，最后一行的 `debug` 值会覆盖覆盖原先`level`字段的 `error` 值，但是 `enable` 字段保持不变。
-```
-log {
-    console_handler{
-        enable=true,
-        level=error
-    }
-}
-
-## 控制台日志打印先定义为 `error` 级，后被覆写成 `debug` 级
-
-log.console_handler.level=debug
-```
-
-#### Map
-
-Map与结构体类似，也是合并覆盖规则。
-如下例子中，`zone1` 的 `max_packet_size` 可以在文件后面覆写。
-
-```
-zone {
-    zone1 {
-        mqtt.max_packet_size = 1M
-    }
-}
-
-## 报文大小限制最先被设置成1MB，后被覆写为10MB
-
-zone.zone1.mqtt.max_packet_size = 10M
-```
-
-#### 数组元素
-
-如上面介绍过，EMQX配置中的数组有两种表达方式。
-
-* 列表格式，例如： `[1, 2, 3]`
-* 带下标的Map格式，例如： `{"1"=1, "2"=2, "3"=3}`
-
-点好（`'.'`）分隔到路径中的纯数字会被解析成数组下标。
-例如，`authentication.1={...}`  会被解析成 `authentication={"1": {...}}`，进而进一步解析成 `authentication=[{...}]`
-有了这个特性，我们就可以轻松覆写数组某个元素的值，例如：
-
-```
-authentication=[{enable=true, backend="built_in_database", mechanism="password_based"}]
-# 可以用下面的方式将第一个元素的 `enable` 字段覆写
-authentication.1.enable=false
-```
-
-::: warning Warning
-使用列表格式是的数组将全量覆写原值，如下例：
-
-```
-authentication=[{enable=true, backend="built_in_database", mechanism="password_based"}]
-## 下面这中方式会导致数组第一个元素的除了 `enable` 以外的其他字段全部丢失
-authentication=[{enable=true}]
-```
-:::
-
-#### TLS/SSL ciphers
-
-从 v5.0.6 开始 EMQX 不在配置文件中详细列出所有默认的密码套件名称。
-而是在配置文件中使用一个空列表，然后在运行时替换成默认的密码套件。
-
-下面这些密码套件是 EMQX 默认支持的：
-
-tlsv1.3:
-```
-ciphers =
-  [ "TLS_AES_256_GCM_SHA384", "TLS_AES_128_GCM_SHA256",
-    "TLS_CHACHA20_POLY1305_SHA256", "TLS_AES_128_CCM_SHA256",
-    "TLS_AES_128_CCM_8_SHA256"
-  ]
-```
-
-tlsv1.2 或更早
-
-```
-ciphers =
-  [ "ECDHE-ECDSA-AES256-GCM-SHA384",
-    "ECDHE-RSA-AES256-GCM-SHA384",
-    "ECDHE-ECDSA-AES256-SHA384",
-    "ECDHE-RSA-AES256-SHA384",
-    "ECDH-ECDSA-AES256-GCM-SHA384",
-    "ECDH-RSA-AES256-GCM-SHA384",
-    "ECDH-ECDSA-AES256-SHA384",
-    "ECDH-RSA-AES256-SHA384",
-    "DHE-DSS-AES256-GCM-SHA384",
-    "DHE-DSS-AES256-SHA256",
-    "AES256-GCM-SHA384",
-    "AES256-SHA256",
-    "ECDHE-ECDSA-AES128-GCM-SHA256",
-    "ECDHE-RSA-AES128-GCM-SHA256",
-    "ECDHE-ECDSA-AES128-SHA256",
-    "ECDHE-RSA-AES128-SHA256",
-    "ECDH-ECDSA-AES128-GCM-SHA256",
-    "ECDH-RSA-AES128-GCM-SHA256",
-    "ECDH-ECDSA-AES128-SHA256",
-    "ECDH-RSA-AES128-SHA256",
-    "DHE-DSS-AES128-GCM-SHA256",
-    "DHE-DSS-AES128-SHA256",
-    "AES128-GCM-SHA256",
-    "AES128-SHA256",
-    "ECDHE-ECDSA-AES256-SHA",
-    "ECDHE-RSA-AES256-SHA",
-    "DHE-DSS-AES256-SHA",
-    "ECDH-ECDSA-AES256-SHA",
-    "ECDH-RSA-AES256-SHA",
-    "ECDHE-ECDSA-AES128-SHA",
-    "ECDHE-RSA-AES128-SHA",
-    "DHE-DSS-AES128-SHA",
-    "ECDH-ECDSA-AES128-SHA",
-    "ECDH-RSA-AES128-SHA"
-  ]
-```
-
-配置 PSK 认证的监听器
-
-```
-ciphers = [
-  [ "RSA-PSK-AES256-GCM-SHA384",
-    "RSA-PSK-AES256-CBC-SHA384",
-    "RSA-PSK-AES128-GCM-SHA256",
-    "RSA-PSK-AES128-CBC-SHA256",
-    "RSA-PSK-AES256-CBC-SHA",
-    "RSA-PSK-AES128-CBC-SHA",
-    "PSK-AES256-GCM-SHA384",
-    "PSK-AES128-GCM-SHA256",
-    "PSK-AES256-CBC-SHA384",
-    "PSK-AES256-CBC-SHA",
-    "PSK-AES128-CBC-SHA256",
-    "PSK-AES128-CBC-SHA"
-  ]
-```