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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.
FWIW, the open source registry application itself is essentially stateless. You just run multiple copies of it and point all of them at the same storage for a High Availability setup. If you have GlusterFS, you can mount it to the local filesystem and use the filesystem storage driver, though you may need to tweak settings for it to function properly (example).
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.