"httpHeaderName"
"httpCookie"
"useSourceIp"
"httpQueryParameterName"
"minimumRingSize"
"path"
"tcpKeepalive"
"http1MaxPendingRequests"
"http2MaxRequests"
"maxRequestsPerConnection"
"maxRetries"
"idleTimeout"
"h2UpgradePolicy"
"useClientProtocol"
"probes"
"from"
"to"
"workloadSelector"
"configPatches"
"proxyVersion"
"metadata"
"service"
"vhost"
"gateway"
"filterChain"
"operation"
"value"
"filterClass"

spec:
  host: istiod.istio-system.svc.cluster.local
  trafficPolicy:
    portLevelSettings:
    - port:
        number: 15012
      tls:
        mode: SIMPLE
      connectionPool:
        http:
          h2UpgradePolicy: UPGRADE        
    - port:
        number: 443
      tls: