Google Cloud Pub/Sub

A high-performance asynchronous messaging service that decouples event producers from consumers using a global, managed backbone.

Pub/Sub handles 500 million messages per second and provides 99.95% availability for distributed systems. It eliminates manual scaling by automatically adjusting to traffic spikes (bursting from zero to millions of requests) while maintaining consistent sub-second latency. Developers use it to connect microservices like Cloud Functions and GKE, stream data into BigQuery for real-time analytics, or manage asynchronous workflows across global regions. The service supports both push and pull delivery models, ensuring reliable message persistence and at-least-once delivery for every subscriber.

https://cloud.google.com/pubsub