istio功能[熔斷]

在併發的連接和請求數超過一個，在istio-proxy進行進一步的請求和連接時，後續請求活連接將被阻止

apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: httpbin              #規則名稱
spec:
  host: httpbin              #後端svc
  trafficPolicy:
    connectionPool:
      tcp:
        maxConnections: 1     #最大連接數
      http:
        http1MaxPendingRequests: 1        #最大請求數
        maxRequestsPerConnection: 1
    outlierDetection:
      consecutiveErrors: 1
      interval: 1s
      baseEjectionTime: 3m
      maxEjectionPercent: 100