Stumbler contribution metrics were watched closely until Firefox Android MLS collection scaled up to a point where it was providing nearly all of the collection. AFAIK, these metrics are no longer maintained.
As for the future of Stumbler, that is a good question, I don’t have any info on that.
> On May 30, 2018, at 8:59 PM, John Karahalis wrote:
> I used to be a pretty active user of Mozilla Stumbler. I would run the app
> almost all the time and intentionally drive around unmapped areas.
> I've become less active over time because it's been a while since I've
> heard about the project. Is Mozilla Stumbler still alive? Is the data it
> collects still useful? I'd be happy to start contributing again if it would
> be helpful.
> John Karahalis
> dev-geolocation mailing list