syntax = "proto3";

package envoy.data.cluster.v2alpha;

option java_outer_classname = "OutlierDetectionEventProto";
option java_multiple_files = true;
option java_package = "io.envoyproxy.envoy.data.cluster.v2alpha";

import "google/protobuf/timestamp.proto";
import "google/protobuf/wrappers.proto";

import "validate/validate.proto";
import "gogoproto/gogo.proto";

option (gogoproto.equal_all) = true;

// [#protodoc-title: Outlier detection logging events]
// :ref:`Outlier detection logging <arch_overview_outlier_detection_logging>`.

message OutlierDetectionEvent {
  // In case of eject represents type of ejection that took place.
  OutlierEjectionType type = 1 [(validate.rules).enum.defined_only = true];
  // Timestamp for event.
  google.protobuf.Timestamp timestamp = 2 [(gogoproto.stdtime) = true];
  // The time in seconds since the last action (either an ejection or unejection) took place.
  google.protobuf.UInt64Value secs_since_last_action = 3;
  // The :ref:`cluster <envoy_api_msg_Cluster>` that owns the ejected host.
  string cluster_name = 4 [(validate.rules).string.min_bytes = 1];
  // The URL of the ejected host. E.g., ``tcp://1.2.3.4:80``.
  string upstream_url = 5 [(validate.rules).string.min_bytes = 1];
  // The action that took place.
  Action action = 6 [(validate.rules).enum.defined_only = true];
  // If ``action`` is ``eject``, specifies the number of times the host has been ejected (local to
  // that Envoy and gets reset if the host gets removed from the upstream cluster for any reason and
  // then re-added).
  uint32 num_ejections = 7;
  // If ``action`` is ``eject``, specifies if the ejection was enforced. ``true`` means the host was
  // ejected. ``false`` means the event was logged but the host was not actually ejected.
  bool enforced = 8;

  oneof event {
    option (validate.required) = true;
    OutlierEjectSuccessRate eject_success_rate_event = 9;
    OutlierEjectConsecutive eject_consecutive_event = 10;
  }
}

// Type of ejection that took place
enum OutlierEjectionType {
  // In case upstream host returns certain number of consecutive 5xx
  CONSECUTIVE_5XX = 0;
  // In case upstream host returns certain number of consecutive gateway errors
  CONSECUTIVE_GATEWAY_FAILURE = 1;
  // Runs over aggregated success rate statistics from every host in cluster
  SUCCESS_RATE = 2;
}

// Represents possible action applied to upstream host
enum Action {
  // In case host was excluded from service
  EJECT = 0;
  // In case host was brought back into service
  UNEJECT = 1;
}

message OutlierEjectSuccessRate {
  // Host’s success rate at the time of the ejection event on a 0-100 range.
  uint32 host_success_rate = 1 [(validate.rules).uint32.lte = 100];
  // Average success rate of the hosts in the cluster at the time of the ejection event on a 0-100
  // range.
  uint32 cluster_average_success_rate = 2 [(validate.rules).uint32.lte = 100];
  // Success rate ejection threshold at the time of the ejection event.
  uint32 cluster_success_rate_ejection_threshold = 3 [(validate.rules).uint32.lte = 100];
}

message OutlierEjectConsecutive {
}