add debug

go/vt/discovery/topology_watcher.go

@@ -198,10 +198,18 @@ func (tw *TopologyWatcher) loadTablets() {
 	}
 
 	for alias, newVal := range newTablets {
+		// debugging
+		log.Infof("Adding tablet: %s", newVal.tablet.Hostname)
+		if tw.tabletFilter == nil {
+			log.Error("slack: the tablet filter is not defined")
+		}
+
 		if tw.tabletFilter != nil && !tw.tabletFilter.IsIncluded(newVal.tablet) {
 			continue
 		}
 
+		log.Infof("slack: %s is not filtered out", newVal.tablet.Hostname)
+
 		// Trust the alias from topo and add it if it doesn't exist.
 		if val, ok := tw.tablets[alias]; ok {
 			// check if the host and port have changed. If yes, replace tablet.