To send Custom Metric data with an Analytics Pageview tag, what do we need to add to the Pageview tag in Tag Manager?

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To send Custom Metric data with an Analytics Pageview tag, what do we need to add to the Pageview tag in Tag Manager?

·         The Tag Manager account ID
·         The Analytics property ID
·         A Javascript push method
·         The Custom Metric index number
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.