Consumer workers not working in parallel

[maestre3d]

Describe the bug
A Consumer job is not being executed in parallel.

To Reproduce
Steps to reproduce the behavior:

1. Start a job with N+1 workers
2. Publish an event into the Message broker

Expected behavior

• A Consumer worker must be reading messages in parallel.
• A Consumer and Broker should be able to shutdown in parallel.

Use as reference the worker-job Go concurrency pattern.