Update log format

Co-authored-by: Dean Coakley <dean.s.coakley@gmail.com>

cmd/sync/main.go

@@ -128,7 +128,11 @@ func main() {
 				}
 
 				if len(added) > 0 || len(removed) > 0 || len(updated) > 0 {
-					log.Printf("Updated HTTP servers of %v; Added: %+v, Removed: %+v, Updated: %+v", upstream, added, removed, updated)
+					addedAddresses := getUpstreamServerAddresses(added)
+					removedAddresses := getUpstreamServerAddresses(removed)
+					updatedAddresses := getUpstreamServerAddresses(updated)
+					log.Printf("Updated HTTP servers of %v for group %v ; Added: %+v, Removed: %+v, Updated: %+v",
+						upstream.Name, upstream.ScalingGroup, addedAddresses, removedAddresses, updatedAddresses)
 				}
 			} else {
 				var upsServers []nginx.StreamUpstreamServer
@@ -150,7 +154,11 @@ func main() {
 				}
 
 				if len(added) > 0 || len(removed) > 0 || len(updated) > 0 {
-					log.Printf("Updated Stream servers of %v; Added: %+v, Removed: %+v, Updated: %+v", upstream, added, removed, updated)
+					addedAddresses := getStreamUpstreamServerAddresses(added)
+					removedAddresses := getStreamUpstreamServerAddresses(removed)
+					updatedAddresses := getStreamUpstreamServerAddresses(updated)
+					log.Printf("Updated Stream servers of %v for group %v ; Added: %+v, Removed: %+v, Updated: %+v",
+						upstream.Name, upstream.ScalingGroup, addedAddresses, removedAddresses, updatedAddresses)
 				}
 			}
 
@@ -164,3 +172,19 @@ func main() {
 		}
 	}
 }
+
+func getUpstreamServerAddresses(server []nginx.UpstreamServer) []string {
+	var upstreamServerAddr []string
+	for _, s := range server {
+		upstreamServerAddr = append(upstreamServerAddr, s.Server)
+	}
+	return upstreamServerAddr
+}
+
+func getStreamUpstreamServerAddresses(server []nginx.StreamUpstreamServer) []string {
+	var streamUpstreamServerAddr []string
+	for _, s := range server {
+		streamUpstreamServerAddr = append(streamUpstreamServerAddr, s.Server)
+	}
+	return streamUpstreamServerAddr
+}