Envoyfilter defining the descriptors in the configmap

envoyfilter.yml

---
apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: python-api-filter-ratelimit-svc
spec:
  workloadSelector:
    labels:
      app: python-api
  configPatches:
    - applyTo: VIRTUAL_HOST
      match:
        context: SIDECAR_INBOUND
        routeConfiguration:
          vhost:
            name: ""
            route:
              action: ANY


      patch:
        operation: MERGE
        # Applies the rate limit rules.
        value:
          rate_limits:
            - actions:
              - header_value_match:
                  # Uses preset key of "header_match"
                  descriptor_value: "TEST_API_PATH_MATCH"
                  headers:
                  - name: ":path"
                    prefix_match: "/index"
              - request_headers:
                  header_name: "X-TEST-API-HEADER-VALUE"
                  descriptor_key: "TEST-API-HEADER-VALUE"

              limit:
                dynamic_metadata:
                  metadata_key:
                    key: "envoy.filters.http.ratelimit.override"
                    path:
                    - key: "limit"
---