How to trace MQTT

[kehuili]

In examples, we need to pass request context to extract or inject information, however, there's no such thing in MQTT when publish or subscribe messages. I would like to know if there is a way to trace MQTT, thanks.

[wu-sheng]

I am not sure what do you mean no such thing. Header or so-called metadata exist in queue, including Kafka, RocketMQ, ActiveMQ, etc. It is a common concept, and there are various queue-based instrumentation in different language agents.