apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: stats-filter
spec:
  configPatches:
    - applyTo: HTTP_FILTER
      match:
        context: SIDECAR_OUTBOUND
        listener:
          filterChain:
            filter:
              name: "envoy.http_connection_manager"
              subFilter:
                name: "envoy.router"
      patch:
        operation: INSERT_BEFORE
        value:
          name: envoy.filters.http.wasm
          config:
            config:
              root_id: stats_outbound
              configuration: |
                {
                  "debug": "false",
                  "stat_prefix": "istio",
                }
              vm_config:
                vm_id: stats_outbound
                runtime: envoy.wasm.runtime.null
                code:
                  inline_string: envoy.wasm.stats
    - applyTo: HTTP_FILTER
      match:
        context: SIDECAR_INBOUND
        listener:
          filterChain:
            filter:
              name: "envoy.http_connection_manager"
              subFilter:
                name: "envoy.router"
      patch:
        operation: INSERT_BEFORE
        value:
          name: envoy.filters.http.wasm
          config:
            config:
              root_id: stats_inbound
              configuration: |
                {
                  "debug": "false",
                  "stat_prefix": "istio",
                }
              vm_config:
                vm_id: stats_inbound
                runtime: envoy.wasm.runtime.null
                code:
                  inline_string: envoy.wasm.stats
    - applyTo: HTTP_FILTER
      match:
        context: GATEWAY
        listener:
          filterChain:
            filter:
              name: "envoy.http_connection_manager"
              subFilter:
                name: "envoy.router"
      patch:
        operation: INSERT_BEFORE
        value:
          name: envoy.filters.http.wasm
          config:
            config:
              root_id: stats_outbound
              configuration: |
                {
                  "debug": "false",
                  "stat_prefix": "istio",
                  "disable_host_header_fallback": "true",
                }
              vm_config:
                vm_id: stats_outbound
                runtime: envoy.wasm.runtime.null
                code:
                  inline_string: envoy.wasm.stats