This read-only object reports the interval type, such as 15-minute or 24-hour bins, over which this row's performance monitoring statistics were collected, per the description. Admins use it to know exactly what time window a given set of counters represents, which is essential for correctly interpreting rate-based metrics like error or utilization counters. For example, comparing a 15-minute interval bin against a 24-hour bin for the same port would require checking this object first to avoid misreading a short spike as a sustained daily trend.