Which metric would NOT typically be used to measure the success of a campaign in Adobe Journey Optimizer?

In the context of measuring the success of a campaign in Adobe Journey Optimizer, the expiration date is not a relevant metric. The expiration date pertains to the timeframe within which a campaign or offer is valid, but it does not provide insight into how well the campaign has performed. Metrics such as engagement rate, conversion rate, and customer satisfaction scores are directly indicative of campaign effectiveness.

Engagement rate indicates how well the audience interacts with the campaign, conversion rate measures the success of turning engagements into actions (such as purchases or sign-ups), and customer satisfaction scores assess the overall experience and reception of the campaign by the audience. These metrics provide actionable insights that can be analyzed to determine areas for improvement and the overall impact of the marketing strategies employed.

Therefore, while the expiration date may inform the timing of a campaign's validity, it does not measure success or outcomes, making it the least relevant choice in this context.