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我在负载平衡应用程序的容器中使用特使代理作为反向代理。我们最近发生了一次网络中断，导致 envoy 代理向我们的下游客户端返回 503。通常情况下，当网络中断恢复时，envoy proxy 将能够再次正常连接到我们的上游服务器，并且每个人都很高兴。

但是，在网络中断恢复后，除非我重新启动容器，否则下游客户端仍会收到带有 LR 响应标志的 HTTP 503。我错过了什么吗？有人可以指出我应该如何解决这个问题的正确方向吗？

admin:
  access_log_path: /tmp/admin_access.log
  address:
    socket_address:
      protocol: TCP
      address: 0.0.0.0
      port_value: 9901
static_resources:
  listeners:
  - name: listener_0
    address:
      socket_address:
        protocol: TCP
        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.config.filter.network.http_connection_manager.v2.HttpConnectionManager
          stat_prefix: ingress_http
          server_name: none
          route_config:
            name: local_route
            response_headers_to_remove:
            - x-envoy-upstream-service-time
            virtual_hosts:
            - name: local_service
              domains: ["*"]
              routes:
              - match:
                  prefix: "/"
                route:
                  host_rewrite: api.example.com
                  cluster: service_api
          http_filters:
          - name: envoy.filters.http.router
          access_log:
          - name: envoy.access_loggers.file
            filter:
              not_health_check_filter: {}
            config:
              path: "/dev/stdout"

  clusters:
  - name: service_api
    connect_timeout: 30s
    type: LOGICAL_DNS
    dns_resolvers:
      socket_address:
        address: 127.0.0.1
        port_value: 53
    # Comment out the following line to test on v6 networks
    dns_lookup_family: V4_ONLY
    lb_policy: ROUND_ROBIN
    upstream_connection_options:
      tcp_keepalive: {}
    load_assignment:
      cluster_name: service_api
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: api.example.com
                port_value: 443
    transport_socket:
      name: envoy.transport_sockets.tls
      typed_config:
        "@type": type.googleapis.com/envoy.extensions.transport_sockets.tls.v3.UpstreamTlsContext

任何指针将不胜感激。

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