fix(retainer): Fix missing changes in configuration

apps/emqx_retainer/src/emqx_retainer_schema.erl

@@ -191,14 +191,14 @@ check_duplicate(List) ->
         true -> ok
     end.
 
-retainer_converter(#{<<"deliver_rate">> := <<"infinity">>} = Conf, _Opts) ->
+retainer_converter(#{<<"delivery_rate">> := <<"infinity">>} = Conf, _Opts) ->
     Conf#{
         <<"flow_control">> => #{
             <<"batch_read_number">> => 0,
             <<"batch_deliver_number">> => 0
         }
     };
-retainer_converter(#{<<"deliver_rate">> := RateStr} = Conf, _Opts) ->
+retainer_converter(#{<<"delivery_rate">> := RateStr} = Conf, _Opts) ->
     {ok, RateNum} = emqx_limiter_schema:to_rate(RateStr),
     RawRate = erlang:floor(RateNum * 1000 / emqx_limiter_schema:default_period()),
     Control = #{
@@ -208,5 +208,8 @@ retainer_converter(#{<<"deliver_rate">> := RateStr} = Conf, _Opts) ->
         <<"batch_deliver_limiter">> => #{<<"client">> => #{<<"rate">> => RateStr}}
     },
     Conf#{<<"flow_control">> => Control};
+retainer_converter(#{<<"deliver_rate">> := Delivery} = Conf, Opts) ->
+    Conf1 = maps:remove(<<"deliver_rate">>, Conf),
+    retainer_converter(Conf1#{<<"delivery_rate">> => Delivery}, Opts);
 retainer_converter(Conf, _Opts) ->
     Conf.

apps/emqx_retainer/test/emqx_retainer_SUITE.erl

@@ -758,6 +758,21 @@ t_compatibility_for_deliver_rate(_) ->
                 }
         },
         Parser(R2)
+    ),
+
+    DeliveryInf = <<"retainer.delivery_rate = \"infinity\"">>,
+    ?assertMatch(
+        #{
+            <<"retainer">> :=
+                #{
+                    <<"flow_control">> := #{
+                        <<"batch_deliver_number">> := 0,
+                        <<"batch_read_number">> := 0,
+                        <<"batch_deliver_limiter">> := #{<<"rate">> := infinity}
+                    }
+                }
+        },
+        Parser(DeliveryInf)
     ).
 
 %%--------------------------------------------------------------------

rel/config/examples/retainer.conf.example

@@ -15,7 +15,7 @@ retainer {
     stop_publish_clear_msg = false
 
     ## Maximum retained messages delivery rate per session
-    deliver_rate = "1000/s"
+    delivery_rate = "1000/s"
 
     ## Retained messages store backend
     backend {