[
  {
    "category": "``iot``",
    "description": "AWS IoT Rules Engine adds OpenSearch action. The OpenSearch rule action lets you stream data from IoT sensors and applications to Amazon OpenSearch Service which is a successor to Amazon Elasticsearch Service.",
    "type": "api-change"
  },
  {
    "category": "``ec2``",
    "description": "Adds support for T3 instances on Amazon EC2 Dedicated Hosts.",
    "type": "api-change"
  },
  {
    "category": "Tagged Unions",
    "description": "Introducing support for the `union` trait on structures in request and response objects.",
    "type": "enhancement"
  }
]