What is the appropriate logging code for an operation that succeeds but has unexpected outcomes?

The appropriate logging code for an operation that succeeds but has unexpected outcomes is to use a warning level log. This is because the operation completed successfully, indicating that there were no outright errors or failures, but the unexpected outcomes signify that there is something noteworthy that needs attention.

By using a warning log, the developer signals that while the process was technically successful, there is an anomaly that could potentially lead to issues down the line or that may require further investigation. This helps in maintaining awareness of the application's behavior and ensures that unexpected situations do not go unnoticed.

The warning level signifies caution and alerts developers or system administrators that there might be something requiring their notice, which is appropriate for cases of unexpected outcomes following successful operations.