Kafka ReceiveRawJson disables automatic processing of Envelope.Ping on the consumer's side

[Maflend]

Describe the bug
Calling the ReceiveRawJson method disables the default wolverine behavior associated with processing the wolverine/ping message.

I get an error on the consumer:

fail: Wolverine.Runtime.WolverineRuntime[108]
      Envelope Envelope #08deb4de-0758-b6ea-d8bb-c19fcdfd0000 to kafka://topic/wolverine-test-ping was moved to the error queue
      System.Text.Json.JsonException: '0x01' is an invalid start of a value. Path: $ | LineNumber: 0 | BytePositionInLine: 0.
       ---> System.Text.Json.JsonReaderException: '0x01' is an invalid start of a value. LineNumber: 0 | BytePositionInLine: 0.

If I delete the call to the Receive Raw Json method, there will be no error, the consumer will not be called, everything is correct.

Source code (wolverine version is 5.39.0):

using Wolverine;
using Wolverine.Kafka;
using Wolverine.Runtime;

var builder = WebApplication.CreateBuilder(args);
var kafkaServers = builder.Configuration["Kafka:BootstrapServers"]!;
const string topic = "wolverine-test-ping";

builder.Host.UseWolverine(opts =>
{
    opts.UseKafka(kafkaServers).AutoProvision();
    opts.PublishMessage<Msg>().ToKafkaTopic(topic);
    opts.ListenToKafkaTopic(topic)
        .ReceiveRawJson<Msg>(); // enable or disable this for test
});

var app = builder.Build();

app.MapGet("/ping", async (IWolverineRuntime runtime) =>
{
    var uri = KafkaEndpointUri.Topic(topic);
    var agent = runtime.Endpoints.GetOrBuildSendingAgent(uri);
    await agent.EnqueueOutgoingAsync(Envelope.ForPing(uri));
});

app.Run();

public record Msg(string Name);

public class MsgConsumer
{
    public void Consume(Msg msg, IMessageContext ctx)
    {
        Console.WriteLine($"EnvelopeId = {ctx.Envelope.Id}");
    }
}

To Reproduce
Steps to reproduce the behavior based on the attached source code:

1. Call the ReceiveRawJson method
2. Send a request /ping
3. You should see an exception in the logs

Expected behavior
ReceiveRawJson should not disable the infrastructure behavior of wolverine.

[jeremydmiller]

Fixed by:

• fix(kafka): ReceiveRawJson honors wolverine-ping infrastructure messages (#2838) #2839 (merged into 5.0 — will ship in 5.39.2)
• fix(kafka): ReceiveRawJson honors wolverine-ping infrastructure messages (#2838) #2840 (cherry-picked to main — will ship in 6.0.0-alpha.5)

JsonOnlyMapper.MapIncomingToEnvelope now detects the wolverine-ping marker via the standard message-type Kafka header and short-circuits — stamping envelope.MessageType = Envelope.PingMessageType so BufferedReceiver.IsPing() drops the envelope before handler dispatch. The raw-JSON path is otherwise unchanged. Closing because the auto-close keyword didn't fire across the 5.0 branch.