I have a datasource that may be helpful:
It is a bit too complicated since it tried to support many file types. CSV is the one that works best though
In grafana core, if you enable ‘alpha’ panels, you will see a datasource named ‘Input’ – this lets you save CSV data in the datasource or panel.
I hope to make using simple files part of grafana core, but currently it requires a plugin.
@pooh – you may not need to query it. Really depends what is in the file and how big it is. With the above datasource, the file name represents a time span and that is really the query