Yes, sorry I didn't make it clear! The problem I see with current approach is that it checks for only sub_metric name in `self.important_sub_metrics`. This is checking only the last suffix after splitting by '.'. This line:
```
if items[len(items)-1] in self.important_sub_metrics:
```

This misses the JMeter like cases where `self.important_sub_metrics` set/tuple contains the transaction/device name also  (`Overall_Summary`) along with the sub_metric name (`ResponseTime`). See the definition in naarad_imports:

```
important_sub_metrics_import = {
    'GC': ('GCPause', 'used'),
    'LINKEDINANDROIDRUM': ('launch_time', 'nus_update_time'),
    'SAR-cpuusage': ('%sys', '%usr'),
    'SAR-device': ('%util', 'await'),
    'JMETER': ('Overall_Summary.ResponseTime', 'Overall_Summary.DataThroughput', 'Overall_Summary.qps')
}
```