Event-driven microservices pipeline on GCP Cloud Run uses Pub/Sub topics to decouple three compute services across isolated subnets in a VPC. Service A publishes to Topic A-B, triggering Service B, which publishes to Topic B-C, triggering Service C in a chain. This architecture decouples services, enables independent scaling, and provides reliable asynchronous communication across Cloud Run workloads. Fork this diagram on Diagrams.so to customize subnets, add error handling paths, or integrate Cloud Tasks for delayed processing.