Cloud Functions: A serverless execution environment for building and connecting cloud services, but lacks comprehensive scheduling capabilities for complex pipeline tasks.

Cloud Pub/Sub: A messaging service designed for real-time communication between applications, not suited for scheduling or orchestrating pipeline tasks.

Cloud Scheduler: A fully managed service that allows you to schedule virtually any job, including data ingestion, processing pipelines, and monitoring tasks, at specific times or intervals.

Cloud Tasks: A service that enables the execution of asynchronous tasks, primarily designed for App Engine applications, and not optimized for scheduling complex data pipeline tasks.