Address review comments

examples/.gitignore

@@ -2,7 +2,7 @@ admin_alter_consumer_group_offsets/admin_alter_consumer_group_offsets
 admin_create_acls/admin_create_acls
 admin_create_topic/admin_create_topic
 admin_delete_acls/admin_delete_acls
-admin_delete_groups/admin_delete_groups
+admin_delete_consumer_groups/admin_delete_consumer_groups
 admin_delete_topics/admin_delete_topics
 admin_describe_acls/admin_describe_acls
 admin_describe_config/admin_describe_config

examples/admin_alter_consumer_group_offsets/admin_alter_consumer_group_offsets.go

@@ -82,5 +82,5 @@ func main() {
 		os.Exit(1)
 	}
 
-	fmt.Printf("AlterConsumerGroupOffsets result: %v\n", res)
+	fmt.Printf("AlterConsumerGroupOffsets result: %+v\n", res)
 }

examples/admin_delete_groups/admin_delete_groups.go → examples/admin_delete_consumer_groups/admin_delete_consumer_groups.go

@@ -57,12 +57,12 @@ func main() {
 	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
 	defer cancel()
 
-	res, err := ac.DeleteGroups(ctx, groups,
+	res, err := ac.DeleteConsumerGroups(ctx, groups,
 		kafka.SetAdminRequestTimeout(time.Duration(timeoutSec)*time.Second))
 	if err != nil {
 		fmt.Printf("Failed to delete groups: %s\n", err)
 		os.Exit(1)
 	}
 
-	fmt.Printf("DeleteGroups result: %v\n", res)
+	fmt.Printf("DeleteConsumerGroups result: %+v\n", res)
 }

examples/admin_describe_consumer_groups/admin_describe_consumer_groups.go

@@ -65,7 +65,7 @@ func main() {
 			"State: %s\n"+
 			"Coordinator: %+v\n"+
 			"Members: %+v\n\n",
-			g.GroupId, g.Error, g.IsSimpleConsumerGroup, g.PartitionAssignor,
+			g.GroupID, g.Error, g.IsSimpleConsumerGroup, g.PartitionAssignor,
 			g.State, g.Coordinator, g.Members)
 	}
 }

examples/admin_list_consumer_group_offsets/admin_list_consumer_group_offsets.go

@@ -85,5 +85,5 @@ func main() {
 		os.Exit(1)
 	}
 
-	fmt.Printf("ListConsumerGroupOffset result: %v\n", res)
+	fmt.Printf("ListConsumerGroupOffset result: %+v\n", res)
 }

examples/admin_list_consumer_groups/admin_list_consumer_groups.go

@@ -63,18 +63,28 @@ func main() {
 	listGroupRes, err := a.ListConsumerGroups(
 		ctx, kafka.SetAdminConsumerGroupStates(states))
 
-	if err != nil || len(listGroupRes.Errors) > 0 {
-		fmt.Printf("Failed to list groups: %s %v\n", err, listGroupRes.Errors)
+	if err != nil {
+		fmt.Printf("Failed to list groups with client-level error %s\n", err)
 		os.Exit(1)
 	}
 
 	// Print results
-	groups := listGroupRes.ConsumerGroupListings
+	groups := listGroupRes.Valid
 	fmt.Printf("A total of %d consumer group(s) listed:\n", len(groups))
 	for _, group := range groups {
-		fmt.Printf("GroupId: %s\n", group.GroupId)
+		fmt.Printf("GroupId: %s\n", group.GroupID)
 		fmt.Printf("State: %s\n", group.State)
 		fmt.Printf("IsSimpleConsumerGroup: %v\n", group.IsSimpleConsumerGroup)
 		fmt.Println()
 	}
+
+	errs := listGroupRes.Errors
+	if len(errs) == 0 {
+		return
+	}
+
+	fmt.Printf("A total of %d error(s) while listing:\n", len(errs))
+	for _, err := range errs {
+		fmt.Println(err)
+	}
 }