Queue implementation https://github.com/src-d/go-queue should be used for decoupling review creating and it's processing inside the lookout.

Default configuration should work as is, without extra configuration so lookoutd serve runs using in-memory implementation. Other environments will use RabbitMQ.

Deployment envs would use something like Borges does

• lookoutd enqueue responsible only for interacting \w Github and putting new Review events in queue
• lookout dequeue process events from the queue sequentially, transactionally updating DB with event state, posting results back, etc

Most probably, should include few queues:

• queue for new events
• queue for re-processing failures