This is a small tool I built for creating fake time series and samples and sending them to Prometheus (a monitoring system and time series database). It relies on the remote write protocol, so no scraping involved. All samples are either sent immediately or streamed continuously.
I found it very helpful when working with PromQL queries or Alerts or just to try out something quickly.
I think it can also be useful if you want to learn Prometheus and especially PromQL.