Syntax of failure criteria

**Is your feature request related to a problem? Please describe.**
Cannot find in doc syntax of all failure criteria.

**Describe the solution you'd like**
Will be good to have documented somewhere the failure criteria not only in source code :-)

```
const validAggregateList = {
'response_time_ms': ['avg', 'min', 'max', 'p50', 'p90', 'p95', 'p99'],
'requests_per_sec': ['avg'],
'requests': ['count'],
'latency': ['avg', 'min', 'max', 'p50', 'p90', 'p95', 'p99'],
'error': ['percentage']
}
```

**Additional context**
Add any other context or screenshots about the feature request here.