Promiot is an experimental library to allow devices to use Prometheus client library instrumentation locally on device, and convey the metrics over telemetry via Google Cloud IoT Core to be scraped by a Cloud hosted instance of Prometheus for IoT Remote Monitoring.
In golang this can be achieved by directly integrating promiot into your code.
For other languages, a side-car process scrapes metrics locally before sending over MQTT.
See examples folder for demonstration of these patterns.
Promiot provides a built in metric to track the latency of mqtt ack latency:
promiot_mqtt_telemetry_puback_latency
As well as latency of publishing to the cloud: promiot_receive_latency_seconds
This is not an official Google Product.