Bind newest stable non-core components

Close #1100

pkg/cluster/spec/bindversion.go

@@ -19,20 +19,11 @@ import (
 )
 
 // TiDBComponentVersion maps the TiDB version to the third components binding version
+// Empty version should be treate as the the last stable one
 func TiDBComponentVersion(comp, version string) string {
 	switch comp {
-	case ComponentAlertmanager:
-		return "v0.17.0"
-	case ComponentBlackboxExporter:
-		return "v0.12.0"
-	case ComponentNodeExporter:
-		return "v0.17.0"
-	case ComponentPushwaygate:
-		return "v0.7.0"
-	case ComponentCheckCollector:
-		return "" // empty version should be treate as the the last stable one
-	case ComponentSpark, ComponentTiSpark:
-		return "" // empty version should be treate as the the last stable one
+	case ComponentAlertmanager, ComponentBlackboxExporter, ComponentNodeExporter, ComponentPushwaygate, ComponentCheckCollector, ComponentSpark, ComponentTiSpark:
+		return ""
 	default:
 		return version
 	}