PIAF Performance Reporting

I am writing a PowerShell script where I gather Key Performance Indicators and trigger condition based Email and SMS notifications. I am successful on triggering a notification if the OSISoft.PI.Analysis (Status) flag comes up as "Not Running". I'd like to expand on this.

What namespace and class can I find the following performance metrics as seen on the "Performance" tab in PI Explorer?

1. Impact Score
2. Average Lag (ms)
3. Group Trigger Ratio
4. Current Evaluation Lag
5. Average Analysis Count
6. First Trigger Time
7. Last Trigger Time

Thanks