feat: controller for Dynamic Rate Limit Adjustment for Scaling Applications (Gateway API)

[s0uky]

Proposal

Referenced from: GitHub Issue #4447

Scenario:

• An application is deployed with 3 replicas.
• The rate limits for the application are set at 6 requests/second per client.
• When KEDA scales the application from 3 replicas to 6, it would be beneficial if the rate-limiting configuration in Envoy Gateway automatically adjusted to reflect this change. For instance, the rate limit should scale to 12 requests/second (calculated as the default rate limit per replica multiplied by the number of replicas).

Proposal:
Introduce a controller that helps dynamically adjusts API Gateway settings - such as rate limits or request thresholds - based on changes in the deployment.

Why Envoy Gateway?
I chose Envoy Gateway as the example because it’s a progressive implementation of Gateway APIs. However, this controller concept could be designed to work across different vendors to ensure flexibility and scalability.

Use-Case

This feature would significantly enhance the adaptability of API Gateways to dynamic environments, improving both performance and user experience.

Is this a feature you are interested in implementing yourself?

No

Anything else?

No response

[s0uky]

I decided to move it to the keda project itself: kedacore/keda#6476