Developers are used to monitoring servers.
CPU.
Memory.
Latency.
Errors.
But IoT systems require another layer of observability.
You also need to know:
How many devices are online?
Which devices stopped sending data?
How many messages failed?
How much data is being rejected?
Which sensors are producing unusual values?
Imagine your backend is perfectly healthy.
But 20% of your sensors have stopped communicating.
Your server monitoring might still show green.
The application is technically running.
The physical system isn't.
That's why IoT observability needs to cover both:
software health + device health
This is especially important as deployments grow.
A production IoT system isn't healthy simply because the API returns HTTP 200.
You also need to know whether the physical infrastructure is actually communicating correctly.
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