Reports the lowest rate of authorization requests per second SSG has recorded for TAL, with each new low overwriting the previous recorded minimum. This is the mirror image of cssgTalMaxAuthRate, and a minimum that's unexpectedly non-zero or unusually high can indicate the authorization pipeline is never actually idle, which matters for capacity planning distinct from just watching the peak. A cssgTalMinAuthRate that's stuck near the same value as cssgTalMaxAuthRate would indicate a constant, un-bursty authorization load rather than the normal peak-and-trough pattern of subscriber activity.