MySQLGetDelay is how long retrieving a customer record takes.

MySQLGetDelayStdDev is standard deviation.

RedisFindDelay is how long finding closest drivers takes.

RedisFindDelayStdDev is standard deviation.

RedisGetDelay is how long retrieving a driver record takes.

RedisGetDelayStdDev is standard deviation.

RouteCalcDelay is how long a route calculation takes.

RouteCalcDelayStdDev is standard deviation.

RouteWorkerPoolSize is the size of the worker pool used to query `route` service.

WorkerPoolSize is the size of goroutine pool used to query for routes.