nginxinc/rtapi
This tool measures the latency response of a series of API endpoints and creates a PDF report with an HDR histogram of all API endpoints. rtapi takes either a JSON/YAML file or a JSON string containing endpoint data and query parameters (optional), queries each endpoint using the query parameters (or default query values if no parameters have been specified), and outputs a PDF report containing all the endpoint query results plotted in an HDR histogram.
https://github.com/nginxinc/rtapi