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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.
If you want more of a stripped down system, you can look into DietPi, which is based on Debian. They have a premade VM image available for download so all you have to do is import it. They also have a fancy instaler to select other utilities to install including pihole. It also looks like they are using 1GB of RAM. https://dietpi.com/#download
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.