Google Cloud Pub/Sub:
Delivery of messages in large quantities with push and pull modes.
Auto-scaling, auto-provisioning, support from zero to hundreds GB/second
Independent quota and billing are available for subscribers and publishers.
Multi-region systems can be simplified by global message routing
High availability made easy:
Ensure reliable delivery at all scales with synchronous, cross-zone message replication.
Auto-everything, no-planning
Auto-scaling, auto-provisioning without partitions eliminates the need for planning and ensures that workloads are ready for production from day one.
Advanced features built in:
Filtering, dead letter delivery, and exponential backoff all help to simplify your applications