Added new metric 'proxysql_myhgm_auto_increment_multiplex_total' tracking the number of times that 'auto_increment_delay_multiplex' is triggered

include/MySQL_HostGroups_Manager.h

@@ -300,6 +300,7 @@ struct p_hg_counter {
 		myhgm_myconnpool_push,
 		myhgm_myconnpool_reset,
 		myhgm_myconnpool_destroy,
+		auto_increment_delay_multiplex,
 		__size
 	};
 };
@@ -458,6 +459,7 @@ class MySQL_HostGroups_Manager {
 		unsigned long long access_denied_max_connections;
 		unsigned long long access_denied_max_user_connections;
 		unsigned long long select_for_update_or_equivalent;
+		unsigned long long auto_increment_delay_multiplex;
 
 		//////////////////////////////////////////////////////
 		///              Prometheus Metrics                ///

lib/MySQL_HostGroups_Manager.cpp

@@ -1215,7 +1215,16 @@ hg_metrics_map = std::make_tuple(
 			"proxysql_myhgm_myconnpool_destroy_total",
 			"The number of connections considered unhealthy and therefore closed.",
 			metric_tags {}
-		)
+		),
+
+		// ====================================================================
+
+		std::make_tuple (
+			p_hg_counter::auto_increment_delay_multiplex,
+			"proxysql_myhgm_auto_increment_multiplex_total",
+			"The number of times that 'auto_increment_delay_multiplex' has been triggered.",
+			metric_tags {}
+		),
 	},
 	// prometheus gauges
 	hg_gauge_vector {
@@ -4295,6 +4304,8 @@ void MySQL_HostGroups_Manager::p_update_metrics() {
 	p_update_counter(status.p_counter_array[p_hg_counter::myhgm_myconnpool_reset], status.myconnpoll_reset);
 	p_update_counter(status.p_counter_array[p_hg_counter::myhgm_myconnpool_destroy], status.myconnpoll_destroy);
 
+	p_update_counter(status.p_counter_array[p_hg_counter::auto_increment_delay_multiplex], status.auto_increment_delay_multiplex);
+
 	// Update the *connection_pool* metrics
 	this->p_update_connection_pool();
 	// Update the *gtid_executed* metrics

lib/MySQL_Session.cpp

@@ -4360,6 +4360,7 @@ handler_again:
 								last_HG_affected_rows = current_hostgroup;
 								if (mysql_thread___auto_increment_delay_multiplex && myconn->mysql->insert_id) {
 									myconn->auto_increment_delay_token = mysql_thread___auto_increment_delay_multiplex + 1;
+									__sync_fetch_and_add(&MyHGM->status.auto_increment_delay_multiplex, 1);
 								}
 							}
 						}