IoT Cloudwatch Metrics for Dynamic Thing Groups

Question

I want to be notified when the account reaches the **limit** for Dynamic Thing Groups.

Is there like a AWS metric that I could use to set alarm.

It could be a metric for:
* When CreateDynamicThingGroup fails
* DynamicThingGroup Count
* DynamicThingGroup Limit exceeded

Is there something like that. I want to be notified after or before it fails.

Tank you.

Kevin Holbrook · Answer

Here is one approach:

There is an [IoT Core Metric](https://docs.aws.amazon.com/iot/latest/developerguide/metrics_dimensions.html#iot-metrics) called "AddThingToDynamicThingGroupsFailed" which will likely allow you to achieve what you are attempting.

You could set up a CloudWatchAlarm to evaluate this metric for value change, then use that to trigger your logic. I haven't tested this, but here is the CLI format I would use (YMMV):

aws cloudwatch put-metric-alarm \
    --alarm-name "AddThingToDynamicThingGroupsFailedChangeAlarm" \
    --alarm-description "Alarm triggers on increase in number of failed additions to DynamicThingGroup" \
    --metric-name "AddThingToDynamicThingGroupsFailed" \
    --namespace "YourNamespace" \
    --statistic Average \
    --period 60 \
    --threshold 0 \
    --comparison-operator GreaterThanOrEqualToThreshold \
    --evaluation-periods 1 \
    --datapoints-to-alarm 1 \
    --treat-missing-data notBreaching

IoT Cloudwatch Metrics for Dynamic Thing Groups

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