Instead of using a shared singleton, it's cleaner in Clean Architecture to pass the log object explicitly through the layers.

• Create the log in the controller with the request payload.

• Pass it as an argument into the use case.

• As each layer (use case, services, external API clients) does its job, it adds to the log.

• When done, send it to RabbitMQ.

This way, the log stays tied to the request and avoids shared/global state, which fits Clean Architecture better.