Are the Internet Reliability reports accurate? I see strange results.

Hi - I recently changed internet provider and so have been paying a bit more attention to the data that Fing is providing. I happened to notice that this month my provided router seemed to crash, and as I was away, it took a few days to organise to get it reset - however my fing puck did alert me of the issue... so I was suprised to see that my monthly report declared there were no outages? Even though there is one day of data missing for the month (and i'm suprised it got data on some of the adjoining days when all other devices failed to). This makes me very suspicious of the report and the whole ranking element.

(Reposting as I had this in the network channel, which may have been the wrong place)