[Metrics] kMetrics

Signed-off-by: Ivan 'kuvaldini' Kuvaldin <[email protected]>

irohad/main/subscription.hpp

@@ -82,7 +82,7 @@ namespace iroha {
           [f{std::forward<F>(callback)}](auto /*set_id*/,
                                          auto &object,
                                          auto event_key,
-                                         EventData... args) mutable {
+                                         EventData args) mutable {
             assert(key == event_key);
             std::forward<F>(f)(object, std::move(args));
           });