Apply FallbackTag to leastping and roundrobin

app/router/config.go

@@ -128,12 +128,14 @@ func (br *BalancingRule) Build(ohm outbound.Manager, dispatcher routing.Dispatch
 		return &Balancer{
 			selectors:   br.OutboundSelector,
 			strategy:    &LeastPingStrategy{},
+			fallbackTag: br.FallbackTag,
 			ohm:         ohm,
 		}, nil
 	case "roundrobin":
 		return &Balancer{
 			selectors:   br.OutboundSelector,
 			strategy:    &RoundRobinStrategy{},
+			fallbackTag: br.FallbackTag,
 			ohm:         ohm,
 		}, nil
 	case "leastload":
@@ -148,7 +150,8 @@ func (br *BalancingRule) Build(ohm outbound.Manager, dispatcher routing.Dispatch
 		leastLoadStrategy := NewLeastLoadStrategy(s)
 		return &Balancer{
 			selectors:   br.OutboundSelector,
-			ohm:       ohm, fallbackTag: br.FallbackTag,
+			ohm:         ohm, 
+			fallbackTag: br.FallbackTag,
 			strategy:    leastLoadStrategy,
 		}, nil
 	case "random":
@@ -156,7 +159,8 @@ func (br *BalancingRule) Build(ohm outbound.Manager, dispatcher routing.Dispatch
 	case "":
 		return &Balancer{
 			selectors:   br.OutboundSelector,
-			ohm:       ohm, fallbackTag: br.FallbackTag,
+			ohm:         ohm, 
+			fallbackTag: br.FallbackTag,
 			strategy:    &RandomStrategy{},
 		}, nil
 	default: