suspend fun <T> CircuitBreaker.executeCommandWithFallbackAwait(command: Handler<Future<T>>, fallback: Function<Throwable, T>): T
Same as io.vertx.circuitbreaker.CircuitBreaker but using a callback.
handler - the completion handler receiving either the operation result or the fallback result. The parameter is an because if the fallback is not called, the error is passed to the handler.