'AWS CloudFormation instance-scheduler subscriptions

I am using CloudFormation and instance scheduler to start and stop EC2 instances. I have implemented the CloudFormation template provided by AWS https://aws.amazon.com/solutions/implementations/instance-scheduler/

The template provides an SNS topic which can be subscribed to in order to receive notifications. I have a couple of questions:

Are the notifications just for warning and/or failure events (e.g. EC2 instance could not be stopped or started)?
I have received an email saying: "WARNING : Instance i-xxxxxx could not be hibernated, retry to stop without hibernation". Now I understand this is just a warning and I also realise I do not have hibernation enabled for my EC2 instance - but is there a way I can suppress this message / stop it being sent?

Thank you in advance

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