Hi @thv ,
Yes, that is right, that not all changelog history entries are available. While eazyBI for Jira Cloud can access all history records with Rest API, the eazyBI for Jira Server version can access only a limited part of history records (status transitions, changes in single-select standard fields imported in eazyBI, and logged hours).
See more info here in this community that also provides a JavaScript code for creating a measure for “Activity History”:
best,
Gerda // support@eazyBI.com