refactor(pluglib): move `emqx_plugin_libs_proto_v1` into emqx app

And rename it to `emqx_metrics_proto_v1` in the process.

apps/emqx/src/proto/emqx_metrics_proto_v1.erl

@@ -14,25 +14,26 @@
 %% limitations under the License.
 %%--------------------------------------------------------------------
 
--module(emqx_plugin_libs_proto_v1).
+-module(emqx_metrics_proto_v1).
 
 -behaviour(emqx_bpapi).
 
 -export([
     introduced_in/0,
 
-    get_metrics/3
+    get_metrics/4
 ]).
 
--include_lib("emqx/include/bpapi.hrl").
+-include("bpapi.hrl").
 
 introduced_in() ->
-    "5.0.0".
+    "5.1.0".
 
 -spec get_metrics(
-    node(),
+    [node()],
     emqx_metrics_worker:handler_name(),
-    emqx_metrics_worker:metric_id()
+    emqx_metrics_worker:metric_id(),
-) -> emqx_metrics_worker:metrics() | {badrpc, _}.
+    timeout()
-get_metrics(Node, HandlerName, MetricId) ->
+) -> emqx_rpc:erpc_multicall(emqx_metrics_worker:metrics()).
-    rpc:call(Node, emqx_metrics_worker, get_metrics, [HandlerName, MetricId]).
+get_metrics(Nodes, HandlerName, MetricId, Timeout) ->
+    erpc:multicall(Nodes, emqx_metrics_worker, get_metrics, [HandlerName, MetricId], Timeout).

apps/emqx_plugin_libs/src/emqx_plugin_libs.app.src

@@ -1,7 +1,7 @@
 %% -*- mode: erlang -*-
 {application, emqx_plugin_libs, [
     {description, "EMQX Plugin utility libs"},
-    {vsn, "4.3.11"},
+    {vsn, "4.3.12"},
     {modules, []},
     {applications, [kernel, stdlib]},
     {env, []}

apps/emqx_rule_engine/src/emqx_rule_engine_api.erl

@@ -44,10 +44,13 @@
 %% query callback
 -export([qs2ms/2, run_fuzzy_match/2, format_rule_info_resp/1]).
 
+-define(RPC_GET_METRICS_TIMEOUT, 5000).
+
 -define(ERR_BADARGS(REASON), begin
     R0 = err_msg(REASON),
     <<"Bad Arguments: ", R0/binary>>
 end).
+
 -define(CHECK_PARAMS(PARAMS, TAG, EXPR),
     case emqx_rule_api_schema:check_params(PARAMS, TAG) of
         {ok, CheckedParams} ->
@@ -56,6 +59,7 @@ end).
             {400, #{code => 'BAD_REQUEST', message => ?ERR_BADARGS(REASON)}}
     end
 ).
+
 -define(METRICS(
     MATCH,
     PASS,
@@ -87,6 +91,7 @@ end).
         'matched.rate.last5m' => RATE_5
     }
 ).
+
 -define(metrics(
     MATCH,
     PASS,
@@ -527,10 +532,19 @@ printable_function_name(Mod, Func) ->
     list_to_binary(lists:concat([Mod, ":", Func])).
 
 get_rule_metrics(Id) ->
-    Format = fun
+    Nodes = emqx:running_nodes(),
-        (
+    Results = emqx_metrics_proto_v1:get_metrics(Nodes, rule_metrics, Id, ?RPC_GET_METRICS_TIMEOUT),
-            Node,
+    NodeResults = lists:zip(Nodes, Results),
-            #{
+    NodeMetrics = [format_metrics(Node, Metrics) || {Node, {ok, Metrics}} <- NodeResults],
+    NodeErrors = [Result || Result = {_Node, {NOk, _}} <- NodeResults, NOk =/= ok],
+    NodeErrors == [] orelse
+        ?SLOG(warning, #{
+            msg => "rpc_get_rule_metrics_errors",
+            errors => NodeErrors
+        }),
+    NodeMetrics.
+
+format_metrics(Node, #{
     counters :=
         #{
             'matched' := Matched,
@@ -549,8 +563,7 @@ get_rule_metrics(Id) ->
             'matched' :=
                 #{current := Current, max := Max, last5m := Last5M}
         }
-            }
+}) ->
-        ) ->
     #{
         metrics => ?METRICS(
             Matched,
@@ -569,7 +582,7 @@ get_rule_metrics(Id) ->
         ),
         node => Node
     };
-        (Node, _Metrics) ->
+format_metrics(Node, _Metrics) ->
     %% Empty metrics: can happen when a node joins another and a bridge is not yet
     %% replicated to it, so the counters map is empty.
     #{
@@ -589,12 +602,7 @@ get_rule_metrics(Id) ->
             _Last5M = 0
         ),
         node => Node
-            }
+    }.
-    end,
-    [
-        Format(Node, emqx_plugin_libs_proto_v1:get_metrics(Node, rule_metrics, Id))
-     || Node <- mria:running_nodes()
-    ].
 
 aggregate_metrics(AllMetrics) ->
     InitMetrics = ?METRICS(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),