debug: add log for debug discovery

Author: YangruiEmma

pkg/loadbalance/lbcache/cache.go

@@ -163,9 +163,9 @@ func (b *BalancerFactory) Get(ctx context.Context, target rpcinfo.EndpointInfo)
 		return val.(*Balancer), nil
 	}
 	val, err, _ := b.sfg.Do(desc, func() (interface{}, error) {
-		klog.CtxErrorf(ctx, "KITEX-DEBUG: start Resolve")
+		klog.CtxErrorf(ctx, "KITEX-DEBUG: start Resolve, desc=%s", desc)
 		res, err := b.resolver.Resolve(ctx, desc)
-		klog.CtxErrorf(ctx, "KITEX-DEBUG: end Resolve")
+		klog.CtxErrorf(ctx, "KITEX-DEBUG: end Resolve, desc=%s", desc)
 		if err != nil {
 			return nil, err
 		}
@@ -179,6 +179,7 @@ func (b *BalancerFactory) Get(ctx context.Context, target rpcinfo.EndpointInfo)
 		bl.sharedTicker = getSharedTicker(bl, b.opts.RefreshInterval)
 		klog.CtxErrorf(ctx, "KITEX-DEBUG: end getSharedTicker")
 		b.cache.Store(desc, bl)
+		klog.CtxErrorf(ctx, "KITEX-DEBUG: put balancer[desc=%s] into cache", desc)
 		return bl, nil
 	})
 	if err != nil {