feat(split): update some split related perf-counter

src/replica/replica_context.cpp

@@ -252,6 +252,10 @@ bool partition_split_context::cleanup(bool force)
         CLEANUP_TASK(check_state_task, force)
     }
 
+    splitting_start_ts_ns = 0;
+    splitting_start_async_learn_ts_ns = 0;
+    splitting_copy_file_count = 0;
+    splitting_copy_file_size = 0;
     parent_gpid.set_app_id(0);
     is_prepare_list_copied = false;
     is_caught_up = false;

src/replica/replica_stub.cpp

@@ -1846,6 +1846,10 @@ void replica_stub::on_gc()
     _counter_bulk_load_running_count->set(bulk_load_running_count);
     _counter_bulk_load_max_ingestion_time_ms->set(bulk_load_max_ingestion_time_ms);
     _counter_bulk_load_max_duration_time_ms->set(bulk_load_max_duration_time_ms);
+    _counter_replicas_splitting_count->set(splitting_count);
+    _counter_replicas_splitting_max_duration_time_ms->set(splitting_max_duration_time_ms);
+    _counter_replicas_splitting_max_async_learn_time_ms->set(splitting_max_async_learn_time_ms);
+    _counter_replicas_splitting_max_copy_file_size->set(splitting_max_copy_file_size);
 
     ddebug("finish to garbage collection, time_used_ns = %" PRIu64, dsn_now_ns() - start);
 }

src/replica/split/replica_split_manager.cpp

@@ -1068,6 +1068,7 @@ void replica_split_manager::child_partition_active(
         return;
     }
 
+    _stub->_counter_replicas_splitting_recent_split_succ_count->increment();
     _replica->_primary_states.last_prepare_decree_on_new_primary =
         _replica->_prepare_list->max_decree();
     _replica->update_configuration(config);