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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 suspect it depends on how much support and/or hand-holding you need from your hosting provider. I'd hesitate to run an unofficial build/image but I believe the alternative on DO is to use mfsbsd (a memory-file-system installer for FreeBSD) which is also an unofficial build/image.
NOTE:
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Hence, a higher number means a more popular project.