AI-generated Key Takeaways
- 
          A MetricHeader describes a metric column present in a report. 
- 
          Only visible metrics requested in a report create columns and MetricHeaders. 
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          Metrics used only in filters or expressions do not result in columns or headers. 
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          Each MetricHeader includes the metric's name and data type. 
Describes a metric column in the report. Visible metrics requested in a report produce column entries within rows and MetricHeaders. However, metrics used exclusively within filters or expressions do not produce columns in a report; correspondingly, those metrics do not produce headers.
| JSON representation | 
|---|
| {
  "name": string,
  "type": enum ( | 
| Fields | |
|---|---|
| name | 
 The metric's name. | 
| type | 
 The metric's data type. |