Allow specifying speedtest server in request #230
Description
It'd be nice if the /metrics endpoint accepted some kind of input (or even a different path like /metrics/<server-id> so that we can use the same instance for multiple server targets.
My main use case is that I'd like to run a speedtest server at each site and keep track of throughput between multiple sites. Hopefully without having to run a dedicated instance of speedtest-exporter for each combination of sites.