--- title: Quota overview: A template that represents a quota allocation request location: https://istio.io/docs/reference/config/template/quota.html layout: protoc-gen-docs number_of_entries: 2 ---

The `quota` template represents an item for which to check quota.

## Template

The `quota` template represents a piece of data to check Quota for.

When writing the configuration, the value for the fields associated with this template can either be a literal or an expression. Please note that if the datatype of a field is not istio.mixer.adapter.model.v1beta1.Value, then the expression’s inferred type must match the datatype of the field.

Example config:

    apiVersion: "config.istio.io/v1alpha2"
    kind: quota
    metadata:
      name: requestcount
      namespace: istio-system
    spec:
      dimensions:
        source: source.labels["app"] | source.service | "unknown"
        sourceVersion: source.labels["version"] | "unknown"
        destination: destination.labels["app"] | destination.service | "unknown"
        destinationVersion: destination.labels["version"] | "unknown"

Field | Type | Description
--- | --- | ---
`dimensions` | `map<string, istio.mixer.adapter.model.v1beta1.Value>` | The unique identity of the particular quota to manipulate.

## istio.mixer.adapter.model.v1beta1.Value

Value is used inside templates for fields that have dynamic types. The actual datatype of the field depends on the datatype of the expression used in the operator configuration.

Field | Type | Description
--- | --- | ---
`stringValue` | `string (oneof)` | Used for values of type STRING
`int64Value` | `int64 (oneof)` | Used for values of type INT64
`doubleValue` | `double (oneof)` | Used for values of type DOUBLE
`boolValue` | `bool (oneof)` | Used for values of type BOOL
`ipAddressValue` | `istio.mixer.adapter.model.v1beta1.IPAddress (oneof)` | Used for values of type IPAddress
`timestampValue` | `istio.mixer.adapter.model.v1beta1.TimeStamp (oneof)` | Used for values of type TIMESTAMP
`durationValue` | `istio.mixer.adapter.model.v1beta1.Duration (oneof)` | Used for values of type DURATION
`emailAddressValue` | `istio.mixer.adapter.model.v1beta1.EmailAddress (oneof)` | Used for values of type EmailAddress
`dnsNameValue` | `istio.mixer.adapter.model.v1beta1.DNSName (oneof)` | Used for values of type DNSName
`uriValue` | `istio.mixer.adapter.model.v1beta1.Uri (oneof)` | Used for values of type Uri