If you would like to permanently keep an eye on the response times of your instance, the Request Log Analyzer can constantly feed the statistics into your metrics store (supported are Graphite, Prometheus, and InfluxDB).
Let me know if this is useful for you and feel free to suggest improvements, either here or on Github!
How is this different from rlog.jar?
rlog.jar simply lists the slowest responses. This may be helpful for fixing some individual slow routes, but does not give you an overall performance overview with statistics like median response time or 90th percentile response time.
Why is it written in Rust?
The Rust Programming Language Rust is made for fast and safe system tools, so it seems like a good choice. Plus, I really wanted to learn it.