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enum AdRotationMode (v201809)

Indicates the ad rotation mode selected for the creatives in the ad group.

Enumeration Description
UNKNOWN Invalid type. Should not be used except for detecting values that are incorrect, or values that are not yet known to the user.
OPTIMIZE Adwords will optimize your adgroups based on clicks or conversions based on your bidding strategy
ROTATE_FOREVER Ads in the adgroups should rotate evenly forever