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Queue it. It's not particularly urgent that push notifications go out instantaneously. A 99th percentile latency of 5 minutes is fine.

Not if it’s your ride waiting for you in short-term parking space, or a food delivery person at your doorstep.

> or a food delivery person at your doorstep.

That's what doorbells are for.

Haha I look forward to an IoT doorbell company blogging about how they send 2 million door bell rings per second