AWS EC2 Auto Scaling Gets Account-Level Launch Before Terminate
AWS now lets you set Launch Before Terminate as your default replacement strategy across all Auto Scaling groups in your account, so new instances spin up and pass health checks before old ones get terminated. This keeps your apps running at full capacity during refreshes, rebalancing, and lifetime replacements—no more juggling settings per group, and it's available everywhere at no extra cost.
source: [aws/whats-new]