As a data engineer responsible for managing a Cloud Dataflow streaming pipeline, you need to ensure the smooth functioning and performance of this pipeline. The pipeline aggregates events from a Cloud Pub/Sub subscription source within a specified window and writes the aggregated results to a Cloud Storage bucket. Given that the source maintains consistent throughput, it is crucial to monitor and set up alerts using Cloud Stackdriver (now known as Google Cloud's Operations Suite) to ensure that the pipeline processes data correctly and efficiently. What specific Stackdriver alerts should you configure to achieve this monitoring?