We had very similar settings where our codebase was built modular but deployed as monolith. At once we wanted to scale just the Queue processor module out of.

We had very similar settings where our codebase was built modular but deployed as monolith. At once we wanted to scale just the Queue processor module out of. We did deploy complete monolith and only enabled Queue processor on other machine. It did add up to extra memory & disk usage. But in the end it helped our team to deploy without going through microservice architecture.