Performance Max Upgrade status enum for campaign.
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                Not specified. | 
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                Used for return value only. Represents value unknown in this version. | 
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                The upgrade to a Performance Max campaign is in progress. | 
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                The upgrade to a Performance Max campaign is complete. | 
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                The upgrade to a Performance Max campaign failed. The campaign will still serve as it was before upgrade was attempted. | 
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                The campaign is eligible for upgrade to a Performance Max campaign. |