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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.
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panel
Pterodactyl® is a free, open-source game server management panel built with PHP, React, and Go. Designed with security in mind, Pterodactyl runs all game servers in isolated Docker containers while exposing a beautiful and intuitive UI to end users.
As others have mentioned Pterodactyl is probably the best but can be a hard to install for new users, but I've found that AMP made by Cubecoders has been working wonders for me for the past couple years, it's very simple to install and has a lot of support/updates.
For managing a single (Java, Linux) server, I recently made this: https://github.com/jessicarobo/pink-wool
For managing more than one server, which it sounds like you're doing, basically everyone recommends Pterodactyl but I haven't used it.