I've added the Quad9 DNS servers (IPv4 and IPv6) to the DNS Servers list. (https://www.quad9.net/) I've opted not to also add their non-secure alternate servers, as those mainly exist for diagnostics of false positives, and are not the primary focus of the Quad9 service. They do not offer secondary servers, as their primary servers are already geographically distributed and redundant.
Pi-hole Admin Dashboard
Using AdminLTE, this project will create a Web interface for the ad-blocking Pi-hole: a black hole for Internet advertisements.
From this interface, you will be able to see stats on how well your Pi-hole is performing. You will also be able to update the lists used to block ads.
API
A read-only API can be accessed at /admin/api.php. With either no parameters or api.php?summary it returns the following JSON:
{
"domains_being_blocked": "136,708",
"dns_queries_today": "18,108",
"ads_blocked_today": "14,648",
"ads_percentage_today": "80.9"
}
There are many more parameters, such as summaryRaw, overTimeData10mins, topItems, topClients or getQuerySources, getQueryTypes, getForwardDestinations, and finally getAllQueries.
Together with a token it is also possible to enable and disable (also with a set timeout) blocking via the API
The API returns more information (in a slighly different format if FTL is running) - it supports a fall-back to the "old" PHP API if FTL is not running. Test the type and/or version of the API by using the parameter type and version.

We use BrowserStack for multi-platform multi-browser testing.

