Just created a very simple AWS integration that collect Greengrass Nucleus telemetry data as CloudWatch metrics.
This integration will deploy a Lambda function connect to IoT Core MQTT topic where NucleusEmitter component send telemetry data:
The deployed Lambda function put metrics data to CloudWatch using AWS NodeJS SDK:
Timestamp: event.TS / 1000,
Once this integration is installed it will be possible to add metrics widgets into a dashboard and/or creating alarms in order to monitor Greengrass Core devices health.