AI-generated Key Takeaways
- 
          Algorithm Rules are supported by various impression signals. 
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          These signals include data points like day and time, device type, ad position, operating system, mobile model, exchange, environment, country, city, browser, and creative dimension. 
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          Each impression signal's value is stored in a specific field within the comparison value for Algorithm Rules. 
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          IMPRESSION_SIGNAL_UNSPECIFIEDrepresents an unknown signal.
Supported impression signals for Algorithm Rules.
| Enums | |
|---|---|
| IMPRESSION_SIGNAL_UNSPECIFIED | Unknown signal. | 
| DAY_AND_TIME | The day of the week and hour of day the impression was made using browser's local time zone. Value is stored in the dayAndTimeValuefield of the comparison value. | 
| DEVICE_TYPE | Device type. Value is stored in the deviceTypeValuefield of the comparison value. | 
| AD_POSITION | Ad position. Value is stored in the onScreenPositionValuefield of the comparison value. | 
| OPERATING_SYSTEM_ID | The operating system identifier. Value is stored in the int64Valuefield of the comparison value. | 
| MOBILE_MODEL_ID | The mobile model identifier. Value is stored in the int64Valuefield of the comparison value. | 
| EXCHANGE | Exchange. Value is stored in the exchangeValuefield of the comparison value. | 
| ENVIRONMENT | Serving environment. Value is stored in the environmentValuefield of the comparison value. | 
| COUNTRY_ID | The country or region identifier. Value is stored in the int64Valuefield of the comparison value. | 
| CITY_ID | The city identifier. Value is stored in the int64Valuefield of the comparison value. | 
| BROWSER_ID | The browser identifier. Value is stored in the int64Valuefield of the comparison value. | 
| CREATIVE_DIMENSION | Creative height and width in pixels. Value is stored in the creativeDimensionValuefield of the comparison value. |