snmpStorageErrorTime records the date and time when snmpStorageError was last updated, per its description, returning an all-zero value if no error has occurred since initialization for this row. An admin uses this to judge how current a per-row storage error is before acting on it, the same way snmpStorageGlobErrorTime does for the global error. For example, a recent snmpStorageErrorTime alongside a populated snmpStorageError would tell an admin this row's last commit attempt genuinely just failed.