AWS Lambda now supports Availability Zone metadata

AWS Lambda Availability Zone Metadata

AWS Lambda now provides Availability Zone (AZ) metadata through a new metadata endpoint in the Lambda execution environment. Developers can determine the AZ ID of the AZ their Lambda function is running in, enabling AZ-aware routing decisions and resilience patterns.

Lambda automatically provisions and maintains execution environments across multiple AZs within an AWS Region to provide high availability and fault tolerance. Functions can now retrieve their AZ ID with a simple HTTP request, making it easy to implement AZ-aware logic.

What to do

• Use the Powertools for AWS Lambda metadata utility or call the metadata endpoint directly using environment variables.
• Integrates with all Lambda runtimes, including custom runtimes and container images.
• Supported with Lambda capabilities like SnapStart and provisioned concurrency.

AZ metadata support is available at no additional cost in all commercial AWS Regions where Lambda is available. To learn more, visit Lambda documentation.

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