abstract class Sender {
 def send(event: ServingError): Unit
}
trait Log extends Sender {
 override def send(event: ServingError): Unit = {
   Logger.log(event.description)
 }
}
trait Metric extends Sender {
 override def send(event: ServingError): Unit = {
   Monitor.incrementCounter(event.getClass.getSimpleName/*this is not recommended...*/, "errorCode" ->
   event.code.toString)
 }
}
trait S3_Backup extends Sender {
 override def send(event: ServingError): Unit = {
   S3_Client.upload(event.content)
 }
}
trait Kafka extends Sender {
 def send(event: ServingError): Unit = {
   KafkaProducer.send(event.content) }
}