[API Policies] Model Round Robin Policy Issue

Overview

Schema validation inconsistency between YAML definition and Go implementation leads to runtime failures.

Issue Details

Missing requestModel in System Parameters Schema

Files:

• Schema: policy-definition.yaml (lines 34-36)
• Implementation: roundrobin.go (lines 147-195)

Description:
The policy definition YAML declares systemParameters with empty properties, but the Go implementation requires a requestModel parameter with location and identifier fields, validated as required.

Schema Mismatch:

# Current (incorrect)
systemParameters:
  type: object
  properties: {}

# Required (missing)
systemParameters:
  type: object
  properties:
    requestModel:
      type: object
      properties:
        location: {type: string}
        identifier: {type: string}
      required: [location, identifier]
  required: [requestModel]

Proposed Fix:
Update the policy-definition.yaml to include the requestModel structure in systemParameters with proper validation rules.

Impact:
Configuration validation fails to catch missing required parameters, leading to runtime failures.

Reference

• https://github.com/wso2/gateway-controllers/pull/1#:~:text=%F0%9F%9F%A0%20Major%20comments%20(20,1%2D13%20(1)