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Here's an example of a Hanami provider in my app that configures an exception notifier.

Notice that:

1) It only starts in production env
2) Configuration is separated via `prepare` step
3) We set Rollbar as a regular error logger. This means that in other envs no special code is needed. You just do `logger.error(e)`
4) It's

I *could* even add `stop` step that disables Rollbar but it's not needed in my app.