Question about Uptime Institute AWS tier III certificate

Hi, you should go to : https://aws.amazon.com/artifact/ as written

AWS Artifact is your go-to, central resource for compliance-related information that matters 
to you. It provides on-demand access to security and compliance reports from AWS and ISVs 
who sell their products on AWS Marketplace.

So, then, you should find at https://us-east-1.console.aws.amazon.com/artifact/home?region=us-west-2# the document that you are looking for.

AWS data centers are designed to meet the requirements of concurrent maintainability, which is at the core of the Uptime Institute Tier standards. However, AWS has chosen not to have a certified Uptime Institute-based tiering level so that we have more flexibility to ensure the highest level of performance and availability. Specifically, AWS infrastructure within our Availability Zones exceeds concurrent maintainability standards by also focusing on metrics not tracked by those standards. We have a bit more info at https://aws.amazon.com/compliance/uptimeinstitute/ with additional compliance at https://aws.amazon.com/compliance/programs/ Key compliance evidence is shared within the PDF documents in https://aws.amazon.com/artifact/