Upstream clustersUpstream clusters Cluster manager Cluster warming Service discovery Supported service discovery typesOn eventually consistent service discovery Health checking Per cluster member health check configHealth check event loggingPassive health checkingConnection pool interactionsHTTP health checking filterActive health checking fast failureHealth check identityDegraded health Connection pooling HTTP/1.1HTTP/2Health checking interactions Load Balancing OverviewSupported load balancersPriority levelsDegraded endpointsLocality weighted load balancingOverprovisioning FactorPanic thresholdOriginal destinationZone aware routingLoad Balancer Subsets Outlier detection Ejection algorithmDetection typesEjection event loggingConfiguration reference Circuit breaking