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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.
I remember seeing it mentioned on a Reddit post in which the developer releasing modified Apollo mentioned he was working on this. Here Is the relevant commit in the repo which does in fact say (as of several hours ago), "adds ability to set custom user agent".
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