• References: Go, JavaScript, C++, Fastly VCL Variable and Rust SDK

What’s changing?

Customers who use client.geo.metro_code in Varnish Configuration Language (VCL) or metro_code in the Compute Software Development Kits (SDKs) will see three-digit Designated Market Area (DMA) codes become five-digit Census Core Based Statistical Area (CBSA) codes. Locations with no CBSA match will return a value of 0.

What’s next? What do I have to do?

Customers who have hard-coded logic based on metro code values should revise that logic to use the new CBSA codes, and make sure their systems can handle five-digit US metro_code values and a value of 0 where no CBSA match exists. Customers should also review any workflows that rely on DMA-based groupings. We don't recommend building load-bearing logic on metro_code values.

To learn more about CBSA codes, please read FIPS Metropolitan Area (CBSA) Codes and United States Census Bureau.

Customers with any questions or concerns may engage with our Support team through https://support.fastly.com or by contacting your designated account management team members.