Opportunity historical trending is enabled in our org, by default 5 specific fields are monitored. Salesforce allows to select 3 more fields, but offers only a choice from a few, 10 to be exact. We have dozens of fields, but only 10 are offered for selection for historical trending. I do not see any logic in the fields that are selectable. I am the admin of the org, I have permissions to see all fields.
In particular, I miss fields like Stage duration and Age. Anyone has an idea on how to do that?