I've not yet used any of these, but I think InfluxDB stores discrete events. In fact, your description sounds very similar to this comparison of Prometheus and InfluxDB[0]:

> InfluxDB is better geared towards the following use cases: Storing all individual events, not just time series of values. E.g. storing every HTTP request with full metadata vs. storing the cumulative count of HTTP requests for certain dimensions.

[0] https://prometheus.io/docs/introduction/comparison/#promethe...