I think ClickHouse is underestimated as a database for time series. Many companies using it for analytics purposes (like Cloudflare [0]), for logs processing (like Uber [1]). I'm just waiting when someone builds something outstanding for monitoring. Articles like [2] shows ClickHouse potential in this area.
Btw, ClickHouse is under Apache 2 license, which makes it much easier to use in big companies.