Monitor the data transfer bytes in lightsail

Question

I'm using Lightsail instances and I want to avoid getting data transfer costs by turning off the instances before the free data transfer quota is used up. So I want to create a Cloudwatch alarm on the total bytes transferred in a given region.
I have created billing alerts but it is usually too late by the time I find out that the data transfer in a region has passed the threshold and even if I turn off the instance the same day, I get charged for tens of dollars.
Is there a metric I can use for this?

Answer

Hello.

Lightsail instances record metrics called "NetworkIn" and "NetworkOut."  
However, since this metric is not a metric that adds up numbers, you may need to be creative in setting the threshold.  
https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-resource-health-metrics

Monitor the data transfer bytes in lightsail

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