appconfig: multi region replication support

[vivekrpatel8]

Describe the feature

I would like to replicate hosted configuration across multiple regions but using single app config application. We just need to replicate hosted configurations so they can be read from different regions.

Use Case

There is a lack of documentation around how to do multi region hosted configurations using app config. The only way I can think of is to create app config application in different regions.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

AWS CDK Library version (aws-cdk-lib)

2.212.0

AWS CDK CLI version

2.1012.0

Environment details (OS name and version, etc.)

MAC

[pahud]

Hi @vivekrpatel8,

Thank you for this feature request! You've identified an important limitation in AWS AppConfig for multi-region scenarios.

After analyzing the issue, this is fundamentally a service-level limitation in AWS AppConfig itself, not a CDK implementation gap. AWS AppConfig is currently a regional service without native cross-region replication capabilities. Our CDK constructs correctly reflect this underlying service architecture, which is why you currently need separate Application instances per region.

aws-cdk-lib will not include this feature because:

• CDK constructs should reflect underlying AWS service capabilities, not work around service limitations
• Cross-region orchestration belongs at the service level, not the infrastructure-as-code level
• Such functionality would be more appropriate for external community libraries

Recommended next steps:

1. AWS Service Feature Request: Consider submitting this as a feature request to AWS AppConfig through AWS Support or the AWS roadmap
2. External Libraries: If needed urgently, this type of multi-region abstraction could be implemented in external CDK construct libraries
3. Current Workaround: Continue using separate applications per region as the recommended pattern
4. Documentation: We can improve our documentation to better explain multi-region patterns and limitations

Once AWS AppConfig adds native multi-region support at the service level, we would be happy to expose those capabilities through CDK constructs. Until then, the current regional approach remains the correct implementation.

Thank you for bringing this important use case to our attention!

While this is not a bug and we have no plan to implement in aws-cdk-lib, I'm moving this to discussion for community inputs.