Which helm history flag in Helm 4.3 adds a table column showing the revision each rollback restored?

Answer: --show-rollback-revision

Explanation

helm history --show-rollback-revision adds a ROLLBACK column filled from the new rollback_revision field that Helm 4.3 stores on rollback revisions. JSON and YAML output include rollback_revision without the flag. Rollbacks made with an older Helm leave the field empty.