When analyze blocks
A blocked finding means the selected version path is not safe as-is. That usually points to removed components, a missing bridge upgrade, or a target inventory problem.
When rewrite applies zero operations
That is normal for manual-change cases. The tool found migration work, but not a deterministic conversion it can safely execute for you.
When assisted rewrite appears
Assisted rewrite is the middle tier between auto-fix and manual-change. The tool can scaffold the target shape in a separate output artifact, but a person still needs to review the result before import.
When secrets appear blank
NiFi does not export sensitive values in a recoverable form. Preserve references, then rehydrate values in the target environment through Parameter Contexts or secret providers.
When target validation fails
Check the selected extensions manifest, target API URL, auth, and process-group target. Missing extensions should be treated as real blockers, not as cosmetic warnings.