Remove connection counts and limits from public API health checks

Returning the connection limit and active count are not really necessary
for these checks. Instead of returning them in the response to the
health check we log a warning when the connection limit is exceeded.

Author: the-mikedavis

deps/rabbitmq_management/src/rabbit_mgmt_wm_health_check_below_node_connection_limit.erl

@@ -11,6 +11,8 @@
 -export([to_json/2, content_types_provided/2]).
 -export([variances/2]).
 
+-include_lib("kernel/include/logger.hrl").
+
 -include("rabbit_mgmt.hrl").
 -include_lib("rabbitmq_management_agent/include/rabbit_mgmt_records.hrl").
 
@@ -34,16 +36,15 @@ to_json(ReqData, Context) ->
     Limit = rabbit_misc:get_env(rabbit, connection_max, infinity),
     case ActiveConns < Limit of
         true ->
-            rabbit_mgmt_util:reply(
-              #{status => ok,
-                limit => Limit,
-                connections => ActiveConns}, ReqData, Context);
+            rabbit_mgmt_util:reply(#{status => ok}, ReqData, Context);
         false ->
+            ?LOG_WARNING(
+              "Node connection limit is reached. Active connections: ~w, "
+              "limit: ~w",
+              [ActiveConns, Limit]),
             Body = #{
                 status => failed,
-                reason => <<"node connection limit is reached">>,
-                limit => Limit,
-                connections => ActiveConns
+                reason => <<"node connection limit is reached">>
             },
             {Response, ReqData1, Context1} = rabbit_mgmt_util:reply(
                                                Body, ReqData, Context),

deps/rabbitmq_management/src/rabbit_mgmt_wm_health_check_ready_to_serve_clients.erl

@@ -16,6 +16,8 @@
 -export([to_json/2, content_types_provided/2]).
 -export([variances/2]).
 
+-include_lib("kernel/include/logger.hrl").
+
 -include("rabbit_mgmt.hrl").
 -include_lib("rabbitmq_management_agent/include/rabbit_mgmt_records.hrl").
 
@@ -33,8 +35,8 @@ content_types_provided(ReqData, Context) ->
 
 to_json(ReqData, Context) ->
     case check() of
-        {ok, Body} ->
-            rabbit_mgmt_util:reply(Body, ReqData, Context);
+        ok ->
+            rabbit_mgmt_util:reply(#{status => ok}, ReqData, Context);
         {error, Body} ->
             {Response, ReqData1, Context1} = rabbit_mgmt_util:reply(
                                                Body, ReqData, Context),
@@ -62,13 +64,14 @@ check() ->
                     Limit = rabbit_misc:get_env(rabbit, connection_max, infinity),
                     case ActiveConns < Limit of
                         true ->
-                            {ok, #{status => ok,
-                                   limit => Limit,
-                                   connections => ActiveConns}};
+                            ok;
                         false ->
+                            ?LOG_WARNING(
+                              "Node connection limit is reached. Active "
+                              "connections: ~w, limit: ~w",
+                              [ActiveConns, Limit]),
                             {error, #{status => failed,
                                       reason => <<"node connection limit is reached">>,
-                                      limit => Limit,
                                       connections => ActiveConns}}
                     end;
                 [] ->

deps/rabbitmq_management/test/rabbit_mgmt_http_health_checks_SUITE.erl

@@ -476,8 +476,6 @@ below_node_connection_limit_test(Config) ->
     Path = "/health/checks/below-node-connection-limit",
     Check0 = http_get(Config, Path, ?OK),
     ?assertEqual(<<"ok">>, maps:get(status, Check0)),
-    ?assertEqual(0, maps:get(connections, Check0)),
-    ?assertEqual(<<"infinity">>, maps:get(limit, Check0)),
 
     %% Set the connection limit low and open 'limit' connections.
     Limit = 10,
@@ -489,8 +487,6 @@ below_node_connection_limit_test(Config) ->
 
     Body0 = http_get_failed(Config, Path),
     ?assertEqual(<<"failed">>, maps:get(<<"status">>, Body0)),
-    ?assertEqual(10, maps:get(<<"limit">>, Body0)),
-    ?assertEqual(10, maps:get(<<"connections">>, Body0)),
 
     %% Clean up the connections and reset the limit.
     [catch rabbit_ct_client_helpers:close_connection(C) || C <- Connections],
@@ -519,8 +515,6 @@ ready_to_serve_clients_test(Config) ->
 
     Body1 = http_get_failed(Config, Path),
     ?assertEqual(<<"failed">>, maps:get(<<"status">>, Body1)),
-    ?assertEqual(10, maps:get(<<"limit">>, Body1)),
-    ?assertEqual(10, maps:get(<<"connections">>, Body1)),
 
     %% Clean up the connections and reset the limit.
     [catch rabbit_ct_client_helpers:close_connection(C) || C <- Connections],