What is the meaning of "Common TTL"?

[顾吟（Alphared）]

Thanks for providing us the valuable traces.

I would wondering the meaning of the column "Common TTL" in the statics.

Does it mean the most prevalent TTLs?

[peter.waynechina]

Yes, it is the most prevalent TTLs. For most workloads, this field contains all TTLs. However, there are a few workloads that use many (100+) TTLs, on which we report the most common ones. 

Note that some other fields in the stat file may not be accurate.