Katie Smith 5eebcf6452 Put service callback retries on a different queue ...

At the moment, if a service callback fails, it will get put on the retry queue.
This causes a potential problem though:

If a service's callback server goes down, we may generate a lot of retries and
this may then put a lot of items on the retry queue. The retry queue is also
responsible for other important parts of Notify such as retrying message
delivery and we don't want a service's callback server going down to have an
impact on the rest of Notify.

Putting the retries on a different queue means that tasks get processed
faster than if they were put back on the same 'service-callbacks' queue.

2021-02-09 13:31:16 +00:00

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