(ec2): Add support for R9g and R9gd (Graviton5) instance types

[tschoonj]

Describe the feature

AWS recently announced general availability of the R9g and R9gd memory-optimized EC2 instance types, powered by AWS Graviton5 processors:

https://aws.amazon.com/about-aws/whats-new/2026/08/amazon-ec2-r9g-and-r9gd-memory-optimized-instances-are-now-available/

These instances are available in several regions, including EU (Frankfurt) / eu-central-1, which is where we intend to use them.

However, the EC2 InstanceType enum does not yet recognize these new types. The enum is generated from the EC2 service model (services/ec2/src/main/resources/codegen-resources/service-2.json), and as of the latest release (2.54.12) — and on the current master branch — that model contains r8g/r8gd entries but no r9g/r9gd entries (in fact no r9 family at all). The highest r Graviton generation present is gen-8.

As a result, software.amazon.awssdk.services.ec2.model.InstanceType.fromValue("r9g.large") (and the various r9g/r9gd sizes, including the r9gd NVMe-backed variants) resolves to UNKNOWN_TO_SDK_VERSION rather than a real enum value. This breaks calls such as DescribeInstanceTypes and DescribeSpotPriceHistory when those instance types are passed via the strongly-typed InstanceType enum.

Could you please update the EC2 service model to include the new R9g and R9gd instance types so they are available through the InstanceType enum in an upcoming release? Thank you.

Use Case

We are rolling out R9g/R9gd (Graviton5) instances for memory-optimized ARM64 compute in eu-central-1. Our application uses the EC2 client (DescribeInstanceTypes, DescribeSpotPriceHistory) with the typed InstanceType enum to fetch instance specifications and spot pricing. Without the enum values for these new types, those lookups fail and we cannot retrieve specs/pricing for the new instances.

Proposed Solution

Update services/ec2/src/main/resources/codegen-resources/service-2.json to add the r9g.* and r9gd.* instance type values to the InstanceType enum (matching the sizes available for the family), so they are generated into software.amazon.awssdk.services.ec2.model.InstanceType and ship in a subsequent release.

Other Information

• Announcement: https://aws.amazon.com/about-aws/whats-new/2026/08/amazon-ec2-r9g-and-r9gd-memory-optimized-instances-are-now-available/
• Verified against aws-sdk-java-v2 master and the latest release (2.54.12): no r9g/r9gd entries in the EC2 model.
• Related prior request for the M9g/M9gd Graviton5 types: (ec2): Add support for M9g and M9gd (Graviton5) instance types #7029.

Acknowledgements

• I may be able to implement this feature request

AWS Java SDK version used

2.48.2 (also verified the model is missing the types on the latest release 2.54.12 and master)

JDK version used

N/A

Operating System and version

N/A

[bhoradc]

Hi @tschoonj, thank you for reporting this. The service team is already working on the model update for R9g/R9gd. Once it's published, it will flow into the SDK's InstanceType enum in a subsequent release. I'll update this issue once it ships.