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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.
Personally I use Mullvad on Linux Mint. Their client comes with almost all of the functions you mentioned and is that same as the Windows and Mac versions. You can also download a set of OpenVPN or Wireguard configuration files if you want to integrate with the network manager instead.
Also I have a polybar module to display if protonvpn is active or not: https://github.com/realestninja/polybar-protonvpn
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