The set of dimensions to group metrics by.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v23/services/benchmarks_service.proto)

| Fields ||
|---|---|
| ## `date_breakdown` | `https://developers.google.com/google-ads/api/reference/rpc/v23/BenchmarksTimeGranularityEnum.BenchmarksTimeGranularity` The granularity for segmenting metrics by date. When this field is set, a valid date_range in the GenerateBenchmarksMetricsRequest is required and must precisely align with the boundaries of the selected granularity. For example, a monthly breakdown must start on the first day of a month and end on the last day of a month. A quarterly breakdown must start on the first day of a quarter and end on the last day of a quarter. A weekly breakdown must start on a Sunday and end on a Saturday. This is different from the ISO 8601 standard, where weeks start on Monday. |