When I was looking at a separate timer for async timeout evaluation < 1000ms fidelity it became apparent _most_ of the cost in a heartbeat is the timeout evaluation anyway, but also: if you are chasing a lower timeout fidelity you likely want to observe a server outage ASAP as well so I think it makes more sense to actually open up the heartbeat to make it configurable.

NickCraver changed the title Heartbeat: make it configurable Heartbeat interval: Make it configurable

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