I don't think there's any free TSDB available. The project is maybe 3 years old. InfluxDB is more recent and quite limited. Things like sharding is not support

I don't think there's any free TSDB available. The project is maybe 3 years old. InfluxDB is more recent and quite limited. Things like sharding is not supported and they stated it would never be supported except in a paid edition when they make one. Prometheus is more recent. Similar story with scaling. They changed storage formats and rewrote once or twice in the past few years, it's moving really fast. It's more of a standalone product for server metrics (node exporter + prometheus + grafana), wouldn't recommend to use as a general purpose database.