Similar to many other Fivetran clients, we have been facing issues with manually calculating ticket metrics values. The calculated values are already present at the source and it will help us a great deal if Fivetran can sync them... We request Fivetran to seriously consider this and make the tickets metrics data available for syncing.

https://{subdomain}.zendesk.com/api/v2/incremental/tickets/cursor.json?start_time={epochtime}&include=metric_sets