-
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.
That PR was merged and that new --max-upstream-conns flag is present in release version 2021.2.3 and above, but I'm not sure if this is the same issue that OP is seeing.
It's easy to set up: https://github.com/pi-hole/pi-hole/wiki/DNSCrypt-2.0
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.