syntax = "proto3";

package envoy.admin.v2alpha;

import "envoy/admin/v2alpha/metrics.proto";
import "envoy/api/v2/core/address.proto";
import "envoy/api/v2/core/health_check.proto";
import "envoy/type/percent.proto";

// [#protodoc-title: Clusters]

// Admin endpoint uses this wrapper for `/clusters` to display cluster status information.
// See :ref:`/clusters <operations_admin_interface_clusters>` for more information.
message Clusters {
  // Mapping from cluster name to each cluster's status.
  repeated ClusterStatus cluster_statuses = 1;
}

// Details an individual cluster's current status.
message ClusterStatus {
  // Name of the cluster.
  string name = 1;

  // Denotes whether this cluster was added via API or configured statically.
  bool added_via_api = 2;

  // The success rate threshold used in the last interval. The threshold is used to eject hosts
  // based on their success rate. See 
  // :ref:`Cluster outlier detection <arch_overview_outlier_detection>` statistics
  //
  // Note: this field may be omitted in any of the three following cases:
  // 1. There were not enough hosts with enough request volume to proceed with success rate based outlier ejection.
  // 2. The threshold is computed to be < 0 because a negative value implies that there was no threshold for that
  // interval.
  // 3. Outlier detection is not enabled for this cluster.
  envoy.type.Percent success_rate_ejection_threshold = 3;

  // Mapping from host address to the host's current status.
  repeated HostStatus host_statuses = 4;
}

// Current state of a particular host.
message HostStatus {
  // Address of this host.
  envoy.api.v2.core.Address address = 1;

  // Mapping from the name of the statistic to the current value.
  map<string, SimpleMetric> stats = 2;

  // The host's current health status.
  HostHealthStatus health_status = 3;

  // Request success rate for this host over the last calculated interval.
  //
  // Note: the message will not be present if host did not have enough request volume to calculate
  // success rate or the cluster did not have enough hosts to run through success rate outlier
  // ejection.
  envoy.type.Percent success_rate = 4;
}

// Health status for a host.
message HostHealthStatus {
  // The host is currently failing active health checks.
  bool failed_active_health_check = 1;

  // The host is currently considered an outlier and has been ejected.
  bool failed_outlier_check = 2;

  // Health status as reported by EDS. Note: only HEALTHY and UNHEALTHY are currently supported here.
  // TODO(mrice32): pipe through remaining EDS health status possibilities.
  envoy.api.v2.core.HealthStatus eds_health_status = 3;
}