This read-only Gauge32 reports, per its source description, the number of messages that overflowed for this specific syslog output device. Admins treat a rising Overflow count as a sign that this output device's buffer or capacity is being exceeded by the volume of messages sent to it, resulting in lost log data. For example, a buffer-type output device with a climbing Overflow count would need either a larger buffer allocation or a reduction in logged message volume to avoid losing further log entries.