Ask HN: Agencies – how do you manage client technical support?

I work for a small agency and we're currently trying to improve how we manage client technical support for websites we build.

Currently we have six back end developers and two front end developers. We use Jira to handle client reporting and management of reported issues. This is working fine.

What we're struggling with a little bit is management of resources and time management for how client technical support is allocated among developers.

I'd like to get some suggestions on how other developers/managers in web agencies internally manage technical support.

For instance, do you work on tickets ad-hoc or do you have dedicated support developers, or perhaps you run support as a sprint?

Would welcome any advice as this is something we don't quite have right!