// Copyright 2025 Envoy Project Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto3";

package envoy.config.cluster.v3;

import "envoy/config/core/v3/extension.proto";

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

import "udpa/annotations/status.proto";
import "udpa/annotations/versioning.proto";
import "validate/validate.proto";

option java_package = "io.envoyproxy.envoy.config.cluster.v3";
option java_outer_classname = "OutlierDetectionProto";
option java_multiple_files = true;
option go_package = "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3;clusterv3";
option (udpa.annotations.file_status).package_version_status = ACTIVE;

// [#protodoc-title: Outlier detection]

// See the :ref:`architecture overview <arch_overview_outlier_detection>` for
// more information on outlier detection.
// [#next-free-field: 26]
message OutlierDetection {
  option (udpa.annotations.versioning).previous_message_type =
      "envoy.api.v2.cluster.OutlierDetection";

  // The number of consecutive server-side error responses (for HTTP traffic,
  // 5xx responses; for TCP traffic, connection failures; for Redis, failure to
  // respond PONG; etc.) before a consecutive 5xx ejection occurs. Defaults to 5.
  google.protobuf.UInt32Value consecutive_5xx = 1;

  // The time interval between ejection analysis sweeps. This can result in
  // both new ejections as well as hosts being returned to service. Defaults
  // to 10000ms or 10s.
  google.protobuf.Duration interval = 2 [(validate.rules).duration = {gt {}}];

  // The base time that a host is ejected for. The real time is equal to the
  // base time multiplied by the number of times the host has been ejected and is
  // capped by :ref:`max_ejection_time<envoy_v3_api_field_config.cluster.v3.OutlierDetection.max_ejection_time>`.
  // Defaults to 30000ms or 30s.
  google.protobuf.Duration base_ejection_time = 3 [(validate.rules).duration = {gt {}}];

  // The maximum % of an upstream cluster that can be ejected due to outlier detection. Defaults to 10% .
  // Will eject at least one host regardless of the value if :ref:`always_eject_one_host<envoy_v3_api_field_config.cluster.v3.OutlierDetection.always_eject_one_host>` is enabled.
  google.protobuf.UInt32Value max_ejection_percent = 4 [(validate.rules).uint32 = {lte: 100}];

  // The % chance that a host will be actually ejected when an outlier status
  // is detected through consecutive 5xx. This setting can be used to disable
  // ejection or to ramp it up slowly. Defaults to 100.
  google.protobuf.UInt32Value enforcing_consecutive_5xx = 5 [(validate.rules).uint32 = {lte: 100}];

  // The % chance that a host will be actually ejected when an outlier status
  // is detected through success rate statistics. This setting can be used to
  // disable ejection or to ramp it up slowly. Defaults to 100.
  google.protobuf.UInt32Value enforcing_success_rate = 6 [(validate.rules).uint32 = {lte: 100}];

  // The number of hosts in a cluster that must have enough request volume to
  // detect success rate outliers. If the number of hosts is less than this
  // setting, outlier detection via success rate statistics is not performed
  // for any host in the cluster. Defaults to 5.
  google.protobuf.UInt32Value success_rate_minimum_hosts = 7;

  // The minimum number of total requests that must be collected in one
  // interval (as defined by the interval duration above) to include this host
  // in success rate based outlier detection. If the volume is lower than this
  // setting, outlier detection via success rate statistics is not performed
  // for that host. Defaults to 100.
  google.protobuf.UInt32Value success_rate_request_volume = 8;

  // This factor is used to determine the ejection threshold for success rate
  // outlier ejection. The ejection threshold is the difference between the
  // mean success rate, and the product of this factor and the standard
  // deviation of the mean success rate: mean - (stdev *
  // success_rate_stdev_factor). This factor is divided by a thousand to get a
  // double. That is, if the desired factor is 1.9, the runtime value should
  // be 1900. Defaults to 1900.
  google.protobuf.UInt32Value success_rate_stdev_factor = 9;

  // The number of consecutive gateway failures (502, 503, 504 status codes)
  // before a consecutive gateway failure ejection occurs. Defaults to 5.
  google.protobuf.UInt32Value consecutive_gateway_failure = 10;

  // The % chance that a host will be actually ejected when an outlier status
  // is detected through consecutive gateway failures. This setting can be
  // used to disable ejection or to ramp it up slowly. Defaults to 0.
  google.protobuf.UInt32Value enforcing_consecutive_gateway_failure = 11
      [(validate.rules).uint32 = {lte: 100}];

  // Determines whether to distinguish local origin failures from external errors. If set to true
  // the following configuration parameters are taken into account:
  // :ref:`consecutive_local_origin_failure<envoy_v3_api_field_config.cluster.v3.OutlierDetection.consecutive_local_origin_failure>`,
  // :ref:`enforcing_consecutive_local_origin_failure<envoy_v3_api_field_config.cluster.v3.OutlierDetection.enforcing_consecutive_local_origin_failure>`
  // and
  // :ref:`enforcing_local_origin_success_rate<envoy_v3_api_field_config.cluster.v3.OutlierDetection.enforcing_local_origin_success_rate>`.
  // Defaults to false.
  bool split_external_local_origin_errors = 12;

  // The number of consecutive locally originated failures before ejection
  // occurs. Defaults to 5. Parameter takes effect only when
  // :ref:`split_external_local_origin_errors<envoy_v3_api_field_config.cluster.v3.OutlierDetection.split_external_local_origin_errors>`
  // is set to true.
  google.protobuf.UInt32Value consecutive_local_origin_failure = 13;

  // The % chance that a host will be actually ejected when an outlier status
  // is detected through consecutive locally originated failures. This setting can be
  // used to disable ejection or to ramp it up slowly. Defaults to 100.
  // Parameter takes effect only when
  // :ref:`split_external_local_origin_errors<envoy_v3_api_field_config.cluster.v3.OutlierDetection.split_external_local_origin_errors>`
  // is set to true.
  google.protobuf.UInt32Value enforcing_consecutive_local_origin_failure = 14
      [(validate.rules).uint32 = {lte: 100}];

  // The % chance that a host will be actually ejected when an outlier status
  // is detected through success rate statistics for locally originated errors.
  // This setting can be used to disable ejection or to ramp it up slowly. Defaults to 100.
  // Parameter takes effect only when
  // :ref:`split_external_local_origin_errors<envoy_v3_api_field_config.cluster.v3.OutlierDetection.split_external_local_origin_errors>`
  // is set to true.
  google.protobuf.UInt32Value enforcing_local_origin_success_rate = 15
      [(validate.rules).uint32 = {lte: 100}];

  // The failure percentage to use when determining failure percentage-based outlier detection. If
  // the failure percentage of a given host is greater than or equal to this value, it will be
  // ejected. Defaults to 85.
  google.protobuf.UInt32Value failure_percentage_threshold = 16
      [(validate.rules).uint32 = {lte: 100}];

  // The % chance that a host will be actually ejected when an outlier status is detected through
  // failure percentage statistics. This setting can be used to disable ejection or to ramp it up
  // slowly. Defaults to 0.
  //
  // [#next-major-version: setting this without setting failure_percentage_threshold should be
  // invalid in v4.]
  google.protobuf.UInt32Value enforcing_failure_percentage = 17
      [(validate.rules).uint32 = {lte: 100}];

  // The % chance that a host will be actually ejected when an outlier status is detected through
  // local-origin failure percentage statistics. This setting can be used to disable ejection or to
  // ramp it up slowly. Defaults to 0.
  google.protobuf.UInt32Value enforcing_failure_percentage_local_origin = 18
      [(validate.rules).uint32 = {lte: 100}];

  // The minimum number of hosts in a cluster in order to perform failure percentage-based ejection.
  // If the total number of hosts in the cluster is less than this value, failure percentage-based
  // ejection will not be performed. Defaults to 5.
  google.protobuf.UInt32Value failure_percentage_minimum_hosts = 19;

  // The minimum number of total requests that must be collected in one interval (as defined by the
  // interval duration above) to perform failure percentage-based ejection for this host. If the
  // volume is lower than this setting, failure percentage-based ejection will not be performed for
  // this host. Defaults to 50.
  google.protobuf.UInt32Value failure_percentage_request_volume = 20;

  // The maximum time that a host is ejected for. See :ref:`base_ejection_time<envoy_v3_api_field_config.cluster.v3.OutlierDetection.base_ejection_time>`
  // for more information. If not specified, the default value (300000ms or 300s) or
  // :ref:`base_ejection_time<envoy_v3_api_field_config.cluster.v3.OutlierDetection.base_ejection_time>` value is applied, whatever is larger.
  google.protobuf.Duration max_ejection_time = 21 [(validate.rules).duration = {gt {}}];

  // The maximum amount of jitter to add to the ejection time, in order to prevent
  // a 'thundering herd' effect where all proxies try to reconnect to host at the same time.
  // See :ref:`max_ejection_time_jitter<envoy_v3_api_field_config.cluster.v3.OutlierDetection.base_ejection_time>`
  // Defaults to 0s.
  google.protobuf.Duration max_ejection_time_jitter = 22;

  // If active health checking is enabled and a host is ejected by outlier detection, a successful active health check
  // unejects the host by default and considers it as healthy. Unejection also clears all the outlier detection counters.
  // To change this default behavior set this config to ``false`` where active health checking will not uneject the host.
  // Defaults to true.
  google.protobuf.BoolValue successful_active_health_check_uneject_host = 23;

  // Set of host's passive monitors.
  // [#not-implemented-hide:]
  repeated core.v3.TypedExtensionConfig monitors = 24;

  // If enabled, at least one host is ejected regardless of the value of :ref:`max_ejection_percent<envoy_v3_api_field_config.cluster.v3.OutlierDetection.max_ejection_percent>`.
  // Defaults to false.
  google.protobuf.BoolValue always_eject_one_host = 25;
}
