Method: regionAutoscalers.patch

Updates an autoscaler in the specified project using the data included in the request. This method supports PATCH semantics and uses the JSON merge patch format and processing rules.

HTTP request

PATCH https://www.googleapis.com/compute/v1/projects/{project}/regions/{region}/autoscalers

The URL uses gRPC Transcoding syntax.

Path parameters

Parameters
project

string

Project ID for this request.

region

string

Name of the region scoping this request.

Query parameters

Parameters
requestId

string

An optional request ID to identify requests. Specify a unique request ID so that if you must retry your request, the server will know to ignore the request if it has already been completed.

For example, consider a situation where you make an initial request and the request times out. If you make the request again with the same request ID, the server can check if original operation with the same request ID was received, and if so, will ignore the second request. This prevents clients from accidentally creating duplicate commitments.

The request ID must be a valid UUID with the exception that zero UUID is not supported (00000000-0000-0000-0000-000000000000).

autoscaler

string

Name of the autoscaler to patch.

Authorization requires one or more of the following Google IAM permissions on the specified resource autoscaler:

  • compute.autoscalers.get
  • compute.autoscalers.update

Request body

The request body contains data with the following structure:

JSON representation
{
  "id": string,
  "creationTimestamp": string,
  "name": string,
  "description": string,
  "target": string,
  "autoscalingPolicy": {
    "minNumReplicas": number,
    "maxNumReplicas": number,
    "coolDownPeriodSec": number,
    "cpuUtilization": ,
    "customMetricUtilizations": [
      
    ],
    "loadBalancingUtilization": 
  },
  "zone": string,
  "region": string,
  "selfLink": string,
  "status": enum,
  "statusDetails": [
    {
      "message": string,
      "type": enum
    }
  ],
  "kind": string
}
Fields
id

string (fixed64 format)

[Output Only] The unique identifier for the resource. This identifier is defined by the server.

creationTimestamp

string

[Output Only] Creation timestamp in RFC3339 text format.

name

string

Name of the resource. Provided by the client when the resource is created. The name must be 1-63 characters long, and comply with RFC1035. Specifically, the name must be 1-63 characters long and match the regular expression [a-z]([-a-z0-9]*[a-z0-9])? which means the first character must be a lowercase letter, and all following characters must be a dash, lowercase letter, or digit, except the last character, which cannot be a dash.

description

string

An optional description of this resource. Provide this property when you create the resource.

target

string

URL of the managed instance group that this autoscaler will scale.

Authorization requires the following Google IAM permission on the specified resource target:

  • compute.instanceGroupManagers.use

autoscalingPolicy

object

The configuration parameters for the autoscaling algorithm. You can define one or more of the policies for an autoscaler: cpuUtilization, customMetricUtilizations, and loadBalancingUtilization.

If none of these are specified, the default will be to autoscale based on cpuUtilization to 0.6 or 60%.

autoscalingPolicy.minNumReplicas

number

The minimum number of replicas that the autoscaler can scale down to. This cannot be less than 0. If not provided, autoscaler will choose a default value depending on maximum number of instances allowed.

autoscalingPolicy.maxNumReplicas

number

The maximum number of instances that the autoscaler can scale up to. This is required when creating or updating an autoscaler. The maximum number of replicas should not be lower than minimal number of replicas.

autoscalingPolicy.coolDownPeriodSec

number

The number of seconds that the autoscaler should wait before it starts collecting information from a new instance. This prevents the autoscaler from collecting information when the instance is initializing, during which the collected usage would not be reliable. The default time autoscaler waits is 60 seconds.

Virtual machine initialization times might vary because of numerous factors. We recommend that you test how long an instance may take to initialize. To do this, create an instance and time the startup process.

autoscalingPolicy.cpuUtilization

object

Defines the CPU utilization policy that allows the autoscaler to scale based on the average CPU utilization of a managed instance group.

autoscalingPolicy.cpuUtilization.utilizationTarget

number

The target CPU utilization that the autoscaler should maintain. Must be a float value in the range (0, 1]. If not specified, the default is 0.6.

If the CPU level is below the target utilization, the autoscaler scales down the number of instances until it reaches the minimum number of instances you specified or until the average CPU of your instances reaches the target utilization.

If the average CPU is above the target utilization, the autoscaler scales up until it reaches the maximum number of instances you specified or until the average utilization reaches the target utilization.

autoscalingPolicy.customMetricUtilizations[]

object

Configuration parameters of autoscaling based on a custom metric.

autoscalingPolicy.customMetricUtilizations[].metric

string

The identifier (type) of the Stackdriver Monitoring metric. The metric cannot have negative values.

The metric must have a value type of INT64 or DOUBLE.

autoscalingPolicy.customMetricUtilizations[].utilizationTarget

number

The target value of the metric that autoscaler should maintain. This must be a positive value. A utilization metric scales number of virtual machines handling requests to increase or decrease proportionally to the metric.

For example, a good metric to use as a utilizationTarget is www.googleapis.com/compute/instance/network/received_bytes_count. The autoscaler will work to keep this value constant for each of the instances.

autoscalingPolicy.customMetricUtilizations[].utilizationTargetType

enum

Defines how target utilization value is expressed for a Stackdriver Monitoring metric. Either GAUGE, DELTA_PER_SECOND, or DELTA_PER_MINUTE.

autoscalingPolicy.loadBalancingUtilization

object

Configuration parameters of autoscaling based on load balancer.

autoscalingPolicy.loadBalancingUtilization.utilizationTarget

number

Fraction of backend capacity utilization (set in HTTP(s) load balancing configuration) that autoscaler should maintain. Must be a positive float value. If not defined, the default is 0.8.

zone

string

[Output Only] URL of the zone where the instance group resides (for autoscalers living in zonal scope).

region

string

[Output Only] URL of the region where the instance group resides (for autoscalers living in regional scope).

status

enum

[Output Only] The status of the autoscaler configuration.

statusDetails[]

object

[Output Only] Human-readable details about the current state of the autoscaler. Read the documentation for Commonly returned status messages for examples of status messages you might encounter.

statusDetails[].message

string

The status message.

statusDetails[].type

enum

The type of error returned.

kind

string

[Output Only] Type of the resource. Always compute#autoscaler for autoscalers.

Response body

If successful, the response body contains data with the following structure:

An Operation resource, used to manage asynchronous API requests.

JSON representation
{
  "id": string,
  "creationTimestamp": string,
  "name": string,
  "zone": string,
  "clientOperationId": string,
  "operationType": string,
  "targetLink": string,
  "targetId": string,
  "status": enum,
  "statusMessage": string,
  "user": string,
  "progress": number,
  "insertTime": string,
  "startTime": string,
  "endTime": string,
  "error": {
    "errors": [
      {
        "code": string,
        "location": string,
        "message": string
      }
    ]
  },
  "warnings": [
    {
      "code": enum,
      "message": string,
      "data": [
        {
          "key": string,
          "value": string
        }
      ]
    }
  ],
  "httpErrorStatusCode": number,
  "httpErrorMessage": string,
  "selfLink": string,
  "region": string,
  "description": string,
  "kind": string
}
Fields
id

string (fixed64 format)

[Output Only] The unique identifier for the resource. This identifier is defined by the server.

creationTimestamp

string

[Deprecated] This field is deprecated.

name

string

[Output Only] Name of the resource.

zone

string

[Output Only] The URL of the zone where the operation resides. Only available when performing per-zone operations. You must specify this field as part of the HTTP request URL. It is not settable as a field in the request body.

clientOperationId

string

[Output Only] The value of requestId if you provided it in the request. Not present otherwise.

operationType

string

[Output Only] The type of operation, such as insert, update, or delete, and so on.

targetId

string (fixed64 format)

[Output Only] The unique target ID, which identifies a specific incarnation of the target resource.

status

enum

[Output Only] The status of the operation, which can be one of the following: PENDING, RUNNING, or DONE.

statusMessage

string

[Output Only] An optional textual description of the current status of the operation.

user

string

[Output Only] User who requested the operation, for example: user@example.com.

progress

number

[Output Only] An optional progress indicator that ranges from 0 to 100. There is no requirement that this be linear or support any granularity of operations. This should not be used to guess when the operation will be complete. This number should monotonically increase as the operation progresses.

insertTime

string

[Output Only] The time that this operation was requested. This value is in RFC3339 text format.

startTime

string

[Output Only] The time that this operation was started by the server. This value is in RFC3339 text format.

endTime

string

[Output Only] The time that this operation was completed. This value is in RFC3339 text format.

error

object

[Output Only] If errors are generated during processing of the operation, this field will be populated.

error.errors[]

object

[Output Only] The array of errors encountered while processing this operation.

error.errors[].code

string

[Output Only] The error type identifier for this error.

error.errors[].location

string

[Output Only] Indicates the field in the request that caused the error. This property is optional.

error.errors[].message

string

[Output Only] An optional, human-readable error message.

warnings[]

object

[Output Only] If warning messages are generated during processing of the operation, this field will be populated.

warnings[].code

enum

[Output Only] A warning code, if applicable. For example, Compute Engine returns NO_RESULTS_ON_PAGE if there are no results in the response.

warnings[].message

string

[Output Only] A human-readable description of the warning code.

warnings[].data[]

object

[Output Only] Metadata about this warning in key: value format. For example:

"data": [  {  "key": "scope",  "value": "zones/us-east1-d"  }

warnings[].data[].key

string

[Output Only] A key that provides more detail on the warning being returned. For example, for warnings where there are no results in a list request for a particular zone, this key might be scope and the key value might be the zone name. Other examples might be a key indicating a deprecated resource and a suggested replacement, or a warning about invalid network settings (for example, if an instance attempts to perform IP forwarding but is not enabled for IP forwarding).

warnings[].data[].value

string

[Output Only] A warning data value corresponding to the key.

httpErrorStatusCode

number

[Output Only] If the operation fails, this field contains the HTTP error status code that was returned. For example, a 404 means the resource was not found.

httpErrorMessage

string

[Output Only] If the operation fails, this field contains the HTTP error message that was returned, such as NOT FOUND.

region

string

[Output Only] The URL of the region where the operation resides. Only available when performing regional operations. You must specify this field as part of the HTTP request URL. It is not settable as a field in the request body.

description

string

[Output Only] A textual description of the operation, which is set when the operation is created.

kind

string

[Output Only] Type of the resource. Always compute#operation for Operation resources.

Authorization Scopes

Requires one of the following OAuth scopes:

  • https://www.googleapis.com/auth/compute
  • https://www.googleapis.com/auth/cloud-platform

For more information, see the Authentication Overview.

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