Application Load Balancer API, gRPC: BackendGroupService.Update

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Yandex Cloud

Updated at July 9, 2026

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gRPC request
UpdateBackendGroupRequest
StreamBackendGroup
StreamBackend
LoadBalancingConfig
TargetGroupsBackend
HealthCheck
StreamHealthCheck
Payload
HttpHealthCheck
GrpcHealthCheck
PlaintextTransportSettings
SecureTransportSettings
ValidationContext
BackendTls
ConnectionSessionAffinity
HttpBackendGroup
HttpBackend
StorageBucketBackend
HeaderSessionAffinity
CookieSessionAffinity
GrpcBackendGroup
GrpcBackend
operation.Operation

Updates the specified backend group.

gRPC request

rpc Update (UpdateBackendGroupRequest) returns (operation.Operation)

UpdateBackendGroupRequest

{
  "backend_group_id": "string",
  "update_mask": "google.protobuf.FieldMask",
  "name": "string",
  "description": "string",
  "labels": "map<string, string>",
  // Includes only one of the fields `stream`, `http`, `grpc`
  "stream": {
    "backends": [
      {
        "name": "string",
        "backend_weight": "google.protobuf.Int64Value",
        "load_balancing_config": {
          "mode": "LoadBalancingMode",
          "panic_threshold": "int64",
          "locality_aware_routing_percent": "int64",
          "strict_locality": "bool"
        },
        "port": "int64",
        // Includes only one of the fields `target_groups`
        "target_groups": {
          "target_group_ids": [
            "string"
          ]
        },
        // end of the list of possible fields
        "healthchecks": [
          {
            "timeout": "google.protobuf.Duration",
            "interval": "google.protobuf.Duration",
            "interval_jitter_percent": "double",
            "healthy_threshold": "int64",
            "unhealthy_threshold": "int64",
            "healthcheck_port": "int64",
            // Includes only one of the fields `stream`, `http`, `grpc`
            "stream": {
              "send": {
                // Includes only one of the fields `text`
                "text": "string"
                // end of the list of possible fields
              },
              "receive": {
                // Includes only one of the fields `text`
                "text": "string"
                // end of the list of possible fields
              }
            },
            "http": {
              "host": "string",
              "path": "string",
              "use_http2": "bool",
              "expected_statuses": [
                "int64"
              ]
            },
            "grpc": {
              "service_name": "string"
            },
            // end of the list of possible fields
            // Includes only one of the fields `plaintext`, `tls`
            "plaintext": "PlaintextTransportSettings",
            "tls": {
              "sni": "string",
              "validation_context": {
                // Includes only one of the fields `trusted_ca_id`, `trusted_ca_bytes`
                "trusted_ca_id": "string",
                "trusted_ca_bytes": "string"
                // end of the list of possible fields
              }
            }
            // end of the list of possible fields
          }
        ],
        "tls": {
          "sni": "string",
          "validation_context": {
            // Includes only one of the fields `trusted_ca_id`, `trusted_ca_bytes`
            "trusted_ca_id": "string",
            "trusted_ca_bytes": "string"
            // end of the list of possible fields
          }
        },
        "enable_proxy_protocol": "bool",
        "keep_connections_on_host_health_failure": "bool"
      }
    ],
    // Includes only one of the fields `connection`
    "connection": {
      "source_ip": "bool"
    }
    // end of the list of possible fields
  },
  "http": {
    "backends": [
      {
        "name": "string",
        "backend_weight": "google.protobuf.Int64Value",
        "load_balancing_config": {
          "mode": "LoadBalancingMode",
          "panic_threshold": "int64",
          "locality_aware_routing_percent": "int64",
          "strict_locality": "bool"
        },
        "port": "int64",
        // Includes only one of the fields `storage_bucket`, `target_groups`
        "storage_bucket": {
          "bucket": "string"
        },
        "target_groups": {
          "target_group_ids": [
            "string"
          ]
        },
        // end of the list of possible fields
        "healthchecks": [
          {
            "timeout": "google.protobuf.Duration",
            "interval": "google.protobuf.Duration",
            "interval_jitter_percent": "double",
            "healthy_threshold": "int64",
            "unhealthy_threshold": "int64",
            "healthcheck_port": "int64",
            // Includes only one of the fields `stream`, `http`, `grpc`
            "stream": {
              "send": {
                // Includes only one of the fields `text`
                "text": "string"
                // end of the list of possible fields
              },
              "receive": {
                // Includes only one of the fields `text`
                "text": "string"
                // end of the list of possible fields
              }
            },
            "http": {
              "host": "string",
              "path": "string",
              "use_http2": "bool",
              "expected_statuses": [
                "int64"
              ]
            },
            "grpc": {
              "service_name": "string"
            },
            // end of the list of possible fields
            // Includes only one of the fields `plaintext`, `tls`
            "plaintext": "PlaintextTransportSettings",
            "tls": {
              "sni": "string",
              "validation_context": {
                // Includes only one of the fields `trusted_ca_id`, `trusted_ca_bytes`
                "trusted_ca_id": "string",
                "trusted_ca_bytes": "string"
                // end of the list of possible fields
              }
            }
            // end of the list of possible fields
          }
        ],
        "tls": {
          "sni": "string",
          "validation_context": {
            // Includes only one of the fields `trusted_ca_id`, `trusted_ca_bytes`
            "trusted_ca_id": "string",
            "trusted_ca_bytes": "string"
            // end of the list of possible fields
          }
        },
        "use_http2": "bool"
      }
    ],
    // Includes only one of the fields `connection`, `header`, `cookie`
    "connection": {
      "source_ip": "bool"
    },
    "header": {
      "header_name": "string"
    },
    "cookie": {
      "name": "string",
      "ttl": "google.protobuf.Duration",
      "path": "string"
    }
    // end of the list of possible fields
  },
  "grpc": {
    "backends": [
      {
        "name": "string",
        "backend_weight": "google.protobuf.Int64Value",
        "load_balancing_config": {
          "mode": "LoadBalancingMode",
          "panic_threshold": "int64",
          "locality_aware_routing_percent": "int64",
          "strict_locality": "bool"
        },
        "port": "int64",
        // Includes only one of the fields `target_groups`
        "target_groups": {
          "target_group_ids": [
            "string"
          ]
        },
        // end of the list of possible fields
        "healthchecks": [
          {
            "timeout": "google.protobuf.Duration",
            "interval": "google.protobuf.Duration",
            "interval_jitter_percent": "double",
            "healthy_threshold": "int64",
            "unhealthy_threshold": "int64",
            "healthcheck_port": "int64",
            // Includes only one of the fields `stream`, `http`, `grpc`
            "stream": {
              "send": {
                // Includes only one of the fields `text`
                "text": "string"
                // end of the list of possible fields
              },
              "receive": {
                // Includes only one of the fields `text`
                "text": "string"
                // end of the list of possible fields
              }
            },
            "http": {
              "host": "string",
              "path": "string",
              "use_http2": "bool",
              "expected_statuses": [
                "int64"
              ]
            },
            "grpc": {
              "service_name": "string"
            },
            // end of the list of possible fields
            // Includes only one of the fields `plaintext`, `tls`
            "plaintext": "PlaintextTransportSettings",
            "tls": {
              "sni": "string",
              "validation_context": {
                // Includes only one of the fields `trusted_ca_id`, `trusted_ca_bytes`
                "trusted_ca_id": "string",
                "trusted_ca_bytes": "string"
                // end of the list of possible fields
              }
            }
            // end of the list of possible fields
          }
        ],
        "tls": {
          "sni": "string",
          "validation_context": {
            // Includes only one of the fields `trusted_ca_id`, `trusted_ca_bytes`
            "trusted_ca_id": "string",
            "trusted_ca_bytes": "string"
            // end of the list of possible fields
          }
        }
      }
    ],
    // Includes only one of the fields `connection`, `header`, `cookie`
    "connection": {
      "source_ip": "bool"
    },
    "header": {
      "header_name": "string"
    },
    "cookie": {
      "name": "string",
      "ttl": "google.protobuf.Duration",
      "path": "string"
    }
    // end of the list of possible fields
  }
  // end of the list of possible fields
}

Field	Description
backend_group_id	string Required field. ID of the backend group to update. To get the backend group ID, make a BackendGroupService.List request.
update_mask	google.protobuf.FieldMask Field mask that specifies which attributes of the backend group should be updated.
name	string New name for the backend group. The name must be unique within the folder. Value must match the regular expression `\|[a-z][-a-z0-9]{1,61}[a-z0-9]`.
description	string New description of the backend group. The maximum string length in characters is 256.
labels	object (map<string, string>) Backend group labels as `key:value` pairs. For details about the concept, see documentation. Existing set of labels is completely replaced by the provided set, so if you just want to add or remove a label: Get the current set of labels with a BackendGroupService.Get request. Add or remove a label in this set. Send the new set in this field. The maximum string length in characters for each value is 63. The string length in characters for each key must be 1-63. Each key must match the regular expression `[a-z][-_0-9a-z]`. Each value must match the regular expression `[-_0-9a-z]`. No more than 64 per resource.
stream	StreamBackendGroup New list of stream (TCP) backends that the backend group will consist of. Includes only one of the fields `stream`, `http`, `grpc`. New list of backends in the backend group. Existing list of backends is completely replaced by the specified list, so if you just want to add or remove a target, make a BackendGroupService.AddBackend request or a BackendGroupService.RemoveBackend request.
http	HttpBackendGroup New list of HTTP backends that the backend group will consist of. Includes only one of the fields `stream`, `http`, `grpc`. New list of backends in the backend group. Existing list of backends is completely replaced by the specified list, so if you just want to add or remove a target, make a BackendGroupService.AddBackend request or a BackendGroupService.RemoveBackend request.
grpc	GrpcBackendGroup New list of gRPC backends that the backend group will consist of. Includes only one of the fields `stream`, `http`, `grpc`. New list of backends in the backend group. Existing list of backends is completely replaced by the specified list, so if you just want to add or remove a target, make a BackendGroupService.AddBackend request or a BackendGroupService.RemoveBackend request.

StreamBackendGroup

A stream (TCP) backend group resource.

Field

Description

backends[]

StreamBackend

List of stream (TCP) backends.

connection

ConnectionSessionAffinity

Connection-based session affinity configuration.
For now, a connection is defined only by an IP address of the client.

Includes only one of the fields connection.

Session affinity configuration for the backend group.
For details about the concept, see
documentation.
If session affinity is configured, the backend group should contain exactly one active backend (i.e. with positive
HttpBackend.backend_weight), its HttpBackend.backend_type should be TargetGroupsBackend, and its
[LoadBalancingConfig.load_balancing_mode] should be MAGLEV_HASH. If any of these conditions are not met, session
affinity will not work.

StreamBackend

A stream (TCP) backend resource.

Field	Description
name	string Name of the backend. Value must match the regular expression `[a-z][-a-z0-9]{1,61}[a-z0-9]`.
backend_weight	google.protobuf.Int64Value Backend weight. Traffic is distributed between backends of a backend group according to their weights. Weights must be set either for all backends in a group or for none of them. Setting no weights is the same as setting equal non-zero weights for all backends. If the weight is non-positive, traffic is not sent to the backend.
load_balancing_config	LoadBalancingConfig Load balancing configuration for the backend.
port	int64 Port used by all targets to receive traffic. Acceptable values are 0 to 65535, inclusive.
target_groups	TargetGroupsBackend Target groups that belong to the backend. For details about target groups, see documentation. Includes only one of the fields `target_groups`. Reference to targets that belong to the backend.
healthchecks[]	HealthCheck Health checks to perform on targets from target groups. For details about health checking, see documentation. If no health checks are specified, active health checking is not performed.
tls	BackendTls Settings for TLS connections between load balancer nodes and backend targets. If specified, the load balancer establishes TLS-encrypted TCP connections with targets and compares received certificates with the one specified in BackendTls.validation_context. If not specified, the load balancer establishes unencrypted TCP connections with targets.
enable_proxy_protocol	bool If set, proxy protocol will be enabled for this backend.
keep_connections_on_host_health_failure	bool If a backend host becomes unhealthy (as determined by the configured health checks), keep connections to the failed host.

LoadBalancingConfig

A load balancing configuration resource.

Field	Description
mode	enum LoadBalancingMode Load balancing mode for the backend. For details about load balancing modes, see documentation. `ROUND_ROBIN`: Round robin load balancing mode. All endpoints of the backend take their turns to receive requests attributed to the backend. `RANDOM`: Random load balancing mode. Default value. For a request attributed to the backend, an endpoint that receives it is picked at random. `LEAST_REQUEST`: Least request load balancing mode. To pick an endpoint that receives a request attributed to the backend, the power of two choices algorithm is used; that is, two endpoints are picked at random, and the request is sent to the one which has the fewest active requests. `MAGLEV_HASH`: Maglev hashing load balancing mode. Each endpoint is hashed, and a hash table with 65537 rows is filled accordingly, so that every endpoint occupies the same amount of rows. An attribute of each request is also hashed by the same function (if session affinity is enabled for the backend group, the attribute to hash is specified in session affinity configuration). The row with the same number as the resulting value is looked up in the table to determine the endpoint that receives the request. If the backend group with session affinity enabled contains more than one backend with positive weight, endpoints for backends with `MAGLEV_HASH` load balancing mode are picked at `RANDOM` instead.
panic_threshold	int64 Threshold for panic mode. If percentage of healthy backends in the group drops below threshold, panic mode will be activated and traffic will be routed to all backends, regardless of their health check status. This helps to avoid overloading healthy backends. For details about panic mode, see documentation. If the value is `0`, panic mode will never be activated and traffic is routed only to healthy backends at all times. Default value: `0`. Acceptable values are 0 to 100, inclusive.
locality_aware_routing_percent	int64 Percentage of traffic that a load balancer node sends to healthy backends in its availability zone. The rest is divided equally between other zones. For details about zone-aware routing, see documentation. If there are no healthy backends in an availability zone, all the traffic is divided between other zones. If `strict_locality` is `true`, the specified value is ignored. A load balancer node sends all the traffic within its availability zone, regardless of backends' health. Default value: `0`. Acceptable values are 0 to 100, inclusive.
strict_locality	bool Specifies whether a load balancer node should only send traffic to backends in its availability zone, regardless of their health, and ignore backends in other zones. If set to `true` and there are no healthy backends in the zone, the node in this zone will respond to incoming traffic with errors. For details about strict locality, see documentation. If `strict_locality` is `true`, the value specified in `locality_aware_routing_percent` is ignored. Default value: `false`.

TargetGroupsBackend

A resource for target groups that belong to the backend.

Field

Description

target_group_ids[]

string

List of ID's of target groups that belong to the backend.
To get the ID's of all available target groups, make a TargetGroupService.List request.

The number of elements must be greater than 0.

HealthCheck

A health check resource.
For details about the concept, see documentation.

Field	Description
timeout	google.protobuf.Duration Required field. Health check timeout. The timeout is the time allowed for the target to respond to a check. If the target doesn't respond in time, the check is considered failed.
interval	google.protobuf.Duration Required field. Base interval between consecutive health checks.
interval_jitter_percent	double
healthy_threshold	int64 Number of consecutive successful health checks required to mark an unhealthy target as healthy. Both `0` and `1` values amount to one successful check required. The value is ignored when a load balancer is initialized; a target is marked healthy after one successful check. Default value: `0`.
unhealthy_threshold	int64 Number of consecutive failed health checks required to mark a healthy target as unhealthy. Both `0` and `1` values amount to one unsuccessful check required. The value is ignored if a health check is failed due to an HTTP `503 Service Unavailable` response from the target (not applicable to TCP stream health checks). The target is immediately marked unhealthy. Default value: `0`.
healthcheck_port	int64 Port used for health checks. If not specified, the backend port (HttpBackend.port or GrpcBackend.port) is used for health checks. Acceptable values are 0 to 65535, inclusive.
stream	StreamHealthCheck TCP stream health check settings. Includes only one of the fields `stream`, `http`, `grpc`. Protocol-specific health check settings. The protocols of the backend and of its health check may differ, e.g. a gRPC health check may be specified for an HTTP backend.
http	HttpHealthCheck HTTP health check settings. Includes only one of the fields `stream`, `http`, `grpc`. Protocol-specific health check settings. The protocols of the backend and of its health check may differ, e.g. a gRPC health check may be specified for an HTTP backend.
grpc	GrpcHealthCheck gRPC health check settings. Includes only one of the fields `stream`, `http`, `grpc`. Protocol-specific health check settings. The protocols of the backend and of its health check may differ, e.g. a gRPC health check may be specified for an HTTP backend.
plaintext	PlaintextTransportSettings Includes only one of the fields `plaintext`, `tls`. Optional transport protocol for health checks. When not set, health checks use the same protocol as the proxied traffic. Use this when health checks' protocol settings differ from their backend, e.g. plaintext health checks for a TLS backend.
tls	SecureTransportSettings Includes only one of the fields `plaintext`, `tls`. Optional transport protocol for health checks. When not set, health checks use the same protocol as the proxied traffic. Use this when health checks' protocol settings differ from their backend, e.g. plaintext health checks for a TLS backend.

StreamHealthCheck

A resource for TCP stream health check settings.

Field

Description

send

Payload

Message sent to targets during TCP data transfer.
If not specified, no data is sent to the target.

receive

Payload

Data that must be contained in the messages received from targets for a successful health check.
If not specified, no messages are expected from targets, and those that are received are not checked.

Payload

A health check payload resource.

Field

Description

text

string

Payload text.

The string length in characters must be 1-16384.

Includes only one of the fields text.

Payload.

HttpHealthCheck

A resource for HTTP health check settings.

Field	Description
host	string Value for the HTTP/1.1 `Host` header or the HTTP/2 `:authority` pseudo-header used in requests to targets. The string length in characters must be 0-255. Value must match the regular expression `\|[-.a-z0-9]+(:[0-9]+)?`.
path	string HTTP path used in requests to targets: request URI for HTTP/1.1 request line or value for the HTTP/2 `:path` pseudo-header. The string length in characters must be 1-255. Value must match the regular expression `/.*`.
use_http2	bool Enables HTTP/2 usage in health checks. Default value: `false`, HTTP/1.1 is used.
expected_statuses[]	int64 A list of HTTP response statuses considered healthy. By default only 200 HTTP status code considered healthy. Acceptable values are 100 to 599, inclusive.

GrpcHealthCheck

A resource for gRPC health check settings.

Field

Description

service_name

string

Name of the gRPC service to be checked.
If not specified, overall health is checked.
For details about the concept, see GRPC Health Checking Protocol.

PlaintextTransportSettings

Transport settings to be used instead of the settings configured per-cluster

Field	Description
Empty

SecureTransportSettings

Transport settings to be used instead of the settings configured per-cluster

Field

Description

sni

string

SNI string for TLS connections.

The maximum string length in characters is 255. Value must match the regular expression [-.a-z0-9]*.

validation_context

ValidationContext

Validation context for backend TLS connections.

ValidationContext

A TLS validation context resource.

Field

Description

trusted_ca_id

string

Includes only one of the fields trusted_ca_id, trusted_ca_bytes.

TLS certificate issued by a trusted certificate authority (CA).

trusted_ca_bytes

string

X.509 certificate contents in PEM format.

Includes only one of the fields trusted_ca_id, trusted_ca_bytes.

TLS certificate issued by a trusted certificate authority (CA).

BackendTls

A resource for backend TLS settings.

Field

Description

sni

string

Server Name Indication (SNI) string for TLS connections.

The maximum string length in characters is 255. Value must match the regular expression [-.a-z0-9]*.

validation_context

ValidationContext

Validation context for TLS connections.

ConnectionSessionAffinity

A resource for connection-based session affinity configuration.

Field

Description

source_ip

bool

Specifies whether an IP address of the client is used to define a connection for session affinity.

HttpBackendGroup

An HTTP backend group resource.

Field	Description
backends[]	HttpBackend List of HTTP backends.
connection	ConnectionSessionAffinity Connection-based session affinity configuration. For now, a connection is defined only by an IP address of the client. Includes only one of the fields `connection`, `header`, `cookie`. Session affinity configuration for the backend group. For details about the concept, see documentation. If session affinity is configured, the backend group should contain exactly one active backend (i.e. with positive HttpBackend.backend_weight), its HttpBackend.backend_type should be TargetGroupsBackend, and its [LoadBalancingConfig.load_balancing_mode] should be `MAGLEV_HASH`. If any of these conditions are not met, session affinity will not work.
header	HeaderSessionAffinity HTTP-header-field-based session affinity configuration. Includes only one of the fields `connection`, `header`, `cookie`. Session affinity configuration for the backend group. For details about the concept, see documentation. If session affinity is configured, the backend group should contain exactly one active backend (i.e. with positive HttpBackend.backend_weight), its HttpBackend.backend_type should be TargetGroupsBackend, and its [LoadBalancingConfig.load_balancing_mode] should be `MAGLEV_HASH`. If any of these conditions are not met, session affinity will not work.
cookie	CookieSessionAffinity Cookie-based session affinity configuration. Includes only one of the fields `connection`, `header`, `cookie`. Session affinity configuration for the backend group. For details about the concept, see documentation. If session affinity is configured, the backend group should contain exactly one active backend (i.e. with positive HttpBackend.backend_weight), its HttpBackend.backend_type should be TargetGroupsBackend, and its [LoadBalancingConfig.load_balancing_mode] should be `MAGLEV_HASH`. If any of these conditions are not met, session affinity will not work.

HttpBackend

An HTTP backend resource.

Field	Description
name	string Name of the backend. Value must match the regular expression `[a-z][-a-z0-9]{1,61}[a-z0-9]`.
backend_weight	google.protobuf.Int64Value Backend weight. Traffic is distributed between backends of a backend group according to their weights. Weights must be set either for all backends in a group or for none of them. Setting no weights is the same as setting equal non-zero weights for all backends. If the weight is non-positive, traffic is not sent to the backend.
load_balancing_config	LoadBalancingConfig Load balancing configuration for the backend.
port	int64 Port used by all targets to receive traffic. Acceptable values are 0 to 65535, inclusive.
storage_bucket	StorageBucketBackend Object Storage bucket to use as the backend. For details about buckets, see documentation. If a bucket is used as a backend, the list of bucket objects and the objects themselves must be publicly accessible. For instructions, see documentation. Includes only one of the fields `storage_bucket`, `target_groups`. Reference to targets that belong to the backend. A backend may be a set of target groups or an Object Storage bucket. For details about backend types, see documentation.
target_groups	TargetGroupsBackend Target groups that belong to the backend. For details about target groups, see documentation. Includes only one of the fields `storage_bucket`, `target_groups`. Reference to targets that belong to the backend. A backend may be a set of target groups or an Object Storage bucket. For details about backend types, see documentation.
healthchecks[]	HealthCheck Health checks to perform on targets from target groups. For details about health checking, see documentation. If no health checks are specified, active health checking is not performed.
tls	BackendTls Settings for TLS connections between load balancer nodes and backend targets. If specified, the load balancer establishes HTTPS (HTTP over TLS) connections with targets and compares received certificates with the one specified in BackendTls.validation_context. If not specified, the load balancer establishes unencrypted HTTP connections with targets.
use_http2	bool Enables HTTP/2 usage in connections between load balancer nodes and backend targets. Default value: `false`, HTTP/1.1 is used.

StorageBucketBackend

A resource for Object Storage bucket used as a backend. For details about the concept,
see documentation.

Field

Description

bucket

string

Required field. Name of the bucket.

HeaderSessionAffinity

A resource for HTTP-header-field-based session affinity configuration.

Field

Description

header_name

string

Name of the HTTP header field that is used for session affinity.

The string length in characters must be 1-256.

CookieSessionAffinity

A resource for cookie-based session affinity configuration.

Field	Description
name	string Name of the cookie that is used for session affinity. The string length in characters must be 1-256.
ttl	google.protobuf.Duration Maximum age of cookies that are generated for sessions. If set to `0`, session cookies are used, which are stored by clients in temporary memory and are deleted on client restarts. If not set, the balancer does not generate cookies and only uses incoming ones for establishing session affinity.
path	string Path of cookie. This will be used to set the path of a new cookie when it is generated. If path is unspecified or empty, no path will be set for the cookie. The string length in characters must be 0-256.

GrpcBackendGroup

A gRPC backend group resource.

Field	Description
backends[]	GrpcBackend List of gRPC backends.
connection	ConnectionSessionAffinity Connection-based session affinity configuration. For now, a connection is defined only by an IP address of the client. Includes only one of the fields `connection`, `header`, `cookie`. Session affinity configuration for the backend group. For details about the concept, see documentation. If session affinity is configured, the backend group should contain exactly one active backend (i.e. with positive GrpcBackend.backend_weight), and its [LoadBalancingConfig.load_balancing_mode] should be `MAGLEV_HASH`. If any of these conditions are not met, session affinity will not work.
header	HeaderSessionAffinity HTTP-header-field-based session affinity configuration. Includes only one of the fields `connection`, `header`, `cookie`. Session affinity configuration for the backend group. For details about the concept, see documentation. If session affinity is configured, the backend group should contain exactly one active backend (i.e. with positive GrpcBackend.backend_weight), and its [LoadBalancingConfig.load_balancing_mode] should be `MAGLEV_HASH`. If any of these conditions are not met, session affinity will not work.
cookie	CookieSessionAffinity Cookie-based session affinity configuration. Includes only one of the fields `connection`, `header`, `cookie`. Session affinity configuration for the backend group. For details about the concept, see documentation. If session affinity is configured, the backend group should contain exactly one active backend (i.e. with positive GrpcBackend.backend_weight), and its [LoadBalancingConfig.load_balancing_mode] should be `MAGLEV_HASH`. If any of these conditions are not met, session affinity will not work.

GrpcBackend

A gRPC backend resource.

Field	Description
name	string Name of the backend. Value must match the regular expression `[a-z][-a-z0-9]{1,61}[a-z0-9]`.
backend_weight	google.protobuf.Int64Value Backend weight. Traffic is distributed between backends of a backend group according to their weights. Weights must be set either for all backends of a group or for none of them. Setting no weights is the same as setting equal non-zero weights for all backends. If the weight is non-positive, traffic is not sent to the backend.
load_balancing_config	LoadBalancingConfig Load balancing configuration for the backend.
port	int64 Port used by all targets to receive traffic. Acceptable values are 0 to 65535, inclusive.
target_groups	TargetGroupsBackend Target groups that belong to the backend. Includes only one of the fields `target_groups`. Reference to targets that belong to the backend. For now, targets are referenced via target groups.
healthchecks[]	HealthCheck Health checks to perform on targets from target groups. For details about health checking, see documentation. If no health checks are specified, active health checking is not performed.
tls	BackendTls Settings for TLS connections between load balancer nodes and backend targets. If specified, the load balancer establishes HTTPS (HTTP over TLS) connections with targets and compares received certificates with the one specified in BackendTls.validation_context. If not specified, the load balancer establishes unencrypted HTTP connections with targets.

operation.Operation

{
  "id": "string",
  "description": "string",
  "created_at": "google.protobuf.Timestamp",
  "created_by": "string",
  "modified_at": "google.protobuf.Timestamp",
  "done": "bool",
  "metadata": "google.protobuf.Any",
  // Includes only one of the fields `error`, `response`
  "error": "google.rpc.Status",
  "response": "google.protobuf.Any"
  // end of the list of possible fields
}

An Operation resource. For more information, see Operation.

Field	Description
id	string ID of the operation.
description	string Description of the operation. 0-256 characters long.
created_at	google.protobuf.Timestamp Creation timestamp.
created_by	string ID of the user or service account who initiated the operation.
modified_at	google.protobuf.Timestamp The time when the Operation resource was last modified.
done	bool If the value is `false`, it means the operation is still in progress. If `true`, the operation is completed, and either `error` or `response` is available.
metadata	google.protobuf.Any Service-specific metadata associated with the operation. It typically contains the ID of the target resource that the operation is performed on. Any method that returns a long-running operation should document the metadata type, if any.
error	google.rpc.Status The error result of the operation in case of failure or cancellation. Includes only one of the fields `error`, `response`. The operation result. If `done == false` and there was no failure detected, neither `error` nor `response` is set. If `done == false` and there was a failure detected, `error` is set. If `done == true`, exactly one of `error` or `response` is set.
response	google.protobuf.Any The normal response of the operation in case of success. If the original method returns no data on success, such as Delete, the response is google.protobuf.Empty. If the original method is the standard Create/Update, the response should be the target resource of the operation. Any method that returns a long-running operation should document the response type, if any. Includes only one of the fields `error`, `response`. The operation result. If `done == false` and there was no failure detected, neither `error` nor `response` is set. If `done == false` and there was a failure detected, `error` is set. If `done == true`, exactly one of `error` or `response` is set.

Application Load Balancer API, gRPC: BackendGroupService.Update

gRPC requestgRPC request

UpdateBackendGroupRequestUpdateBackendGroupRequest

StreamBackendGroupStreamBackendGroup

StreamBackendStreamBackend

LoadBalancingConfigLoadBalancingConfig

TargetGroupsBackendTargetGroupsBackend

HealthCheckHealthCheck

StreamHealthCheckStreamHealthCheck

PayloadPayload

HttpHealthCheckHttpHealthCheck

GrpcHealthCheckGrpcHealthCheck

PlaintextTransportSettingsPlaintextTransportSettings

SecureTransportSettingsSecureTransportSettings

ValidationContextValidationContext

BackendTlsBackendTls

ConnectionSessionAffinityConnectionSessionAffinity

HttpBackendGroupHttpBackendGroup

HttpBackendHttpBackend

StorageBucketBackendStorageBucketBackend

HeaderSessionAffinityHeaderSessionAffinity

CookieSessionAffinityCookieSessionAffinity

GrpcBackendGroupGrpcBackendGroup

GrpcBackendGrpcBackend

operation.Operationoperation.Operation

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gRPC request

UpdateBackendGroupRequest

StreamBackendGroup

StreamBackend

LoadBalancingConfig

TargetGroupsBackend

HealthCheck

StreamHealthCheck

Payload

HttpHealthCheck

GrpcHealthCheck

PlaintextTransportSettings

SecureTransportSettings

ValidationContext

BackendTls

ConnectionSessionAffinity

HttpBackendGroup

HttpBackend

StorageBucketBackend

HeaderSessionAffinity

CookieSessionAffinity

GrpcBackendGroup

GrpcBackend

operation.Operation