Increased default AMQP heartbeat
Increased default AMQP heartbeat

A ridiculously low heartbeat interval such as 2 seconds will just create false positives. Clients will throw `AMQ::Protocol::EmptyResponseError` if there's a slight glitch, one or few lost packages, in the network traffic and consumers will crash. A more sensible default is 30 seconds. See a similar discussion here: https://github.com/gocardless/hutch/issues/56
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