ACME-proxy for multiple backends on envoy

envoy.yaml

static_resources:
  listeners:
  - name: listener_0
    address:
      socket_address: { address: 0.0.0.0, port_value: 10000 }
    filter_chains:
    - filters:
      - name: envoy.filters.network.http_connection_manager
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
          stat_prefix: ingress_http
          codec_type: AUTO
          route_config:
            name: local_route
            virtual_hosts:
            - name: local_service
              domains: ["*"]
              routes:
              - match: { prefix: "/.well-known/acme-challenge/" }
                route: { cluster: some_service }
              retry_policy:
                num_retries: 10
                host_selection_retry_max_attempts: 10
                retry_on: "connect-failure,gateway-error,refused-stream,reset,retriable-status-codes"
                retriable_status_codes: [404,308]
          http_filters:
          - name: envoy.filters.http.router
  clusters:
  - name: some_service
    connect_timeout: 2s
    type: STATIC
    lb_policy: ROUND_ROBIN
    load_assignment:
      cluster_name: some_service
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: 10.10.8.10
                port_value: 80
        - endpoint:
            address:
              socket_address:
                address: 10.10.8.20
                port_value: 80
        - endpoint:
            address:
              socket_address:
                address: 10.10.8.30
                port_value: 80
        - endpoint:
            address:
              socket_address:
                address: 10.10.8.40
                port_value: 80
        - endpoint:
            address:
              socket_address:
                address: 10.10.8.50
                port_value: 80