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    Method: instances.listReferrers

    Retrieves a list of resources that refer to the VM instance specified in the request. For example, if the VM instance is part of a managed or unmanaged instance group, the referrers list includes the instance group. For more information, read Viewing referrers to VM instances .

    HTTP request

    GET https://compute.googleapis.com/compute/v1/projects/{project}/zones/{zone}/instances/{instance}/referrers

    The URL uses gRPC Transcoding syntax.

    Path parameters

    Parameters
    project

    string

    Project ID for this request.
    zone

    string

    The name of the zone for this request.
    instance

    string

    Name of the target instance scoping this request, or '-' if the request should span over all instances in the container.

    Query parameters

    Parameters
    maxResults

    integer ( uint32 format)

    The maximum number of results per page that should be returned. If the number of available results is larger than maxResults , Compute Engine returns a nextPageToken that can be used to get the next page of results in subsequent list requests. Acceptable values are 0 to 500 , inclusive. (Default: 500 )
    pageToken

    string

    Specifies a page token to use. Set pageToken to the nextPageToken returned by a previous list request to get the next page of results.
    filter

    string

    A filter expression that filters resources listed in the response. Most Compute resources support two types of filter expressions: expressions that support regular expressions and expressions that follow API improvement proposal AIP-160 . These two types of filter expressions cannot be mixed in one request.

    If you want to use AIP-160, your expression must specify the field name, an operator, and the value that you want to use for filtering. The value must be a string, a number, or a boolean. The operator must be either = , != , > , < , <= , >= or : .

    For example, if you are filtering Compute Engine instances, you can exclude instances named example-instance by specifying name != example-instance .

    The :* comparison can be used to test whether a key has been defined. For example, to find all objects with owner label use:

     labels.owner:*

    You can also filter nested fields. For example, you could specify scheduling.automaticRestart = false to include instances only if they are not scheduled for automatic restarts. You can use filtering on nested fields to filter based on resource labels .

    To filter on multiple expressions, provide each separate expression within parentheses. For example:

     (scheduling.automaticRestart = true)
(cpuPlatform = "Intel Skylake")

    By default, each expression is an AND expression. However, you can include AND and OR expressions explicitly. For example:

     (cpuPlatform = "Intel Skylake") OR
(cpuPlatform = "Intel Broadwell") AND
(scheduling.automaticRestart = true)

    If you want to use a regular expression, use the eq (equal) or ne (not equal) operator against a single un-parenthesized expression with or without quotes or against multiple parenthesized expressions. Examples:

    fieldname eq unquoted literal fieldname eq 'single quoted literal' fieldname eq "double quoted literal" (fieldname1 eq literal) (fieldname2 ne "literal")

    The literal value is interpreted as a regular expression using Google RE2 library syntax. The literal value must match the entire field.

    For example, to filter for instances that do not end with name "instance", you would use name ne .*instance .

    You cannot combine constraints on multiple fields using regular expressions.
    orderBy

    string

    Sorts list results by a certain order. By default, results are returned in alphanumerical order based on the resource name.

    You can also sort results in descending order based on the creation timestamp using orderBy="creationTimestamp desc" . This sorts results based on the creationTimestamp field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.

    Currently, only sorting by name or creationTimestamp desc is supported.
    returnPartialSuccess

    boolean

    Opt-in for partial success behavior which provides partial results in case of failure. The default value is false.

    For example, when partial success behavior is enabled, aggregatedList for a single zone scope either returns all resources in the zone or no resources, with an error code.

    Request body

    The request body must be empty.

    Response body

    Contains a list of instance referrers.

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

    JSON representation 
     { 
 "kind" 
 : 
 string 
 , 
 "id" 
 : 
 string 
 , 
 "items" 
 : 
 [ 
 { 
 "kind" 
 : 
 string 
 , 
 "target" 
 : 
 string 
 , 
 "referenceType" 
 : 
 string 
 , 
 "referrer" 
 : 
 string 
 } 
 ] 
 , 
 "nextPageToken" 
 : 
 string 
 , 
 "selfLink" 
 : 
 string 
 , 
 "warning" 
 : 
 { 
 "code" 
 : 
 enum 
 , 
 "message" 
 : 
 string 
 , 
 "data" 
 : 
 [ 
 { 
 "key" 
 : 
 string 
 , 
 "value" 
 : 
 string 
 } 
 ] 
 } 
 }
    Fields
    kind

    string

    [Output Only] Type of resource. Always compute#instanceListReferrers for lists of Instance referrers.

    id

    string

    [Output Only] Unique identifier for the resource; defined by the server.

    items[]

    object

    A list of Reference resources.

    items[].kind

    string

    [Output Only] Type of the resource. Always compute#reference for references.

    items[].target

    string

    URL of the resource to which this reference points.

    items[].referenceType

    string

    A description of the reference type with no implied semantics. Possible values include:

    1. MEMBER_OF
    items[].referrer

    string

    URL of the resource which refers to the target.

    nextPageToken

    string

    [Output Only] This token allows you to get the next page of results for list requests. If the number of results is larger than maxResults , use the nextPageToken as a value for the query parameter pageToken in the next list request. Subsequent list requests will have their own nextPageToken to continue paging through the results.

    warning

    object

    [Output Only] Informational warning message.

    warning.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.

    warning.message

    string

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

    warning.data[]

    object

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

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

    warning.data[].value

    string

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

    Authorization scopes

    Requires one of the following OAuth scopes:

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

    For more information, see the Authentication Overview .

    IAM Permissions

    In addition to any permissions specified on the fields above, authorization requires one or more of the following IAM permissions:

    • compute.instances.listReferrers

    To find predefined roles that contain those permissions, see Compute Engine IAM Roles .
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