QuestDB at least is gaining some popularity: https://questdb.com/

I was hoping to learn about some new potentially viable alternatives to InfluxDB, alas it seems I'll continue using it for now.

I'm running an experimental side project where I doing some kind of glue between various time-series APIs and storage engines.

For example it has an InfluxDB compatible ingestion API, so Telegraf can push its data to it or InfluxDB can replicate to it. It also has a Prometheus remote read and remote write API, so it's compatible with Prometheus.

The storage can be done in various systems, including ClickHouse, SQLite, DuckDB, TimescaleDB… I should try to include QuestDB.