I answered hitliubo's questions offline, but I'll answer them here as well.
1. Yes, it is a GUID that you can generate yourself. The ID makes the analysis unique. If you create your own threshold file and use the same ID or same analysis name, then your analysis will override all other inherited ones with the same name or ID.
2. FROMALLCOUNTERSTATS is just an indicator saying if this analysis came from a threshold file or was it dynamically created in order to match counters in the counter log. This is related to the All Counter Stats feature.
3. ISTHRESHOLDADDED is an indicator to determine if thresholds in the chart need to be added or skip the process of adding thresholds to the chart.