What are the weird queues automatically created in RabbitMQ?

Question

IIS

There is an ecosystem of microservices, which are ASP.NET applications running under IIS and communicating with each other via RabbitMQ using the MassTransit library. Recently, we discovered that when performing some operations and distributing messages in RabbitMQ, queues of the form are automatically generated:


At the same time, an attempt is made to deliver a message to this queue, as if it had a consumer of the propagated message type, after which, all such messages fall into the skipped queue .

Here is an example of such a message:


Accordingly, many such messages can accumulate in the skipped queue in an hour:


As far as I can see, there is no loss of any data or duplicates, just messages accumulate in the skipped queue, they have to be constantly cleaned manually. As far as I understand, the problem can be solved by getting rid of this strange queue, which is created by itself. But I do not understand the nature of its occurrence. Has anyone come across something similar?

Answer 1

It is very similar to the dead-letters queue, you can read in the documentation what messages get there.
If you look at the message MT-Reason: dead-letter