syncer, loader: add more metrics

.gitignore

@@ -14,7 +14,7 @@ relay_log/*
 vendor
 */*.DS_Store
 tidb-slow.log
-/monitoring/dashboards/dm.json
+/monitoring/dashboards/*.json
 /monitoring/rules/dm_worker.rules.yml
 mysql.*.log
 .python-version

dm/config/subtask.go

@@ -223,6 +223,9 @@ type SubTaskConfig struct {
 
 	// still needed by Syncer / Loader bin
 	printVersion bool
+
+	// which DM worker is running the subtask, this will be injected when the real worker starts running the subtask(StartSubTask).
+	WorkerName string `toml:"-" json:"-"`
 }
 
 // NewSubTaskConfig creates a new SubTaskConfig.