AWS has published a service level agreement (SLA) for Amazon Cognito, which provides availability guarantees.
AWS will use commercially reasonable efforts to make Amazon Cognito available with a Monthly Uptime Percentage, of at least 99.9% (the “Service Commitment”). In the event that Cognito does not meet the Service Commitment, you will be eligible to receive a Service Credit as described in the Amazon Cognito Service Level Agreement.
This SLA is now available in all regions where Amazon Cognito is currently available. For more information on where Amazon Cognito is available see the AWS Region Table. Please visit our product page to learn more about Amazon Cognito.