Rewrite autoscaler (checker and handler); add web latency checker#20
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Use separate checker and handler classes. Backwards-incompatible
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Autoscaling is now broken into a 'checker' and a 'handler'.
Checkers can check Sidekiq queue latency, or web request latency, whatever.
Handlers take an action, like logging, sending to Sentry, or scaling dynos in Heroku. There is also a chain handler.
It's now possible to easily create a web dyno autoscaler. It also cleaned up a lot of the internal complexity with the autoscaler parameters.