Instance Tags now available on the Amazon EC2 Instance Metadata Service

You can now access your instance’s tags from the EC2 Instance Metadata Service. Tags enable you to categorize your AWS resources in different ways, for example, by purpose, owner, or environment. This is useful when you have many resources of the same type—you can quickly identify a specific resource based on the tags that you’ve assigned to it. Previously, you could access your instance tags from the console or by using the describe-tags API.

Source:: Amazon AWS