Push Notifications: Can’t Live With Em, Can’t Live Without Em
summary
Vonage runs 16 million notifications a day at about 800 notifications per second and claims end-to-end delivery in 15 milliseconds. The system uses frizzle API, RabbitMQ, a message broker that creates per-user queues, WebSockets for desktop and a push token flow for mobile through a Node service called push me. Trace ids travel via continuation local storage or Node 14 async_hooks, middleware attaches ids to logs and axios headers so each hop is observable and arrival can be blamed when it fails.
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