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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.
Yeah. I haven't personally used Epic's online services for a project yet but I'm exploring it soon (your curiosity led me to this which makes my job stupid easy as I already use Mirror) but I'm thinking it's the most sensible way to go, especially now that it's actually available as a Unity plugin, mostly because it allows you to release on every storefront and maintain crossplay, including mobile VR platforms (though mobile platforms are not officially supported by Epic Online Services yet).
NOTE:
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Hence, a higher number means a more popular project.