Also, TimescaleDB is a general purpose time-series database, which means that it not only works for metrics data, but also many other datatypes (strings, arrays

Also, TimescaleDB is a general purpose time-series database, which means that it not only works for metrics data, but also many other datatypes (strings, arrays, JSON, etc). You can also create indexes on any of these fields. Because TimescaleDB is built on Postgres, it is also a relational time-series database. Ie you can store metadata / business data alongside your time-series data. (Note: I work on TimescaleDB.)