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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You can also have the pihole block these DoH servers, using this: https://github.com/Sekhan/TheGreatWall/blob/master/TheGreatWall.txt but for applications that have a list DoH IP's hardwired into them, then pihole blocking won't catch those because they connect without DNS lookups. You have to block them at your firewall.
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Hence, a higher number means a more popular project.