Export test statistics to a webhook in headless mode

Is your feature request related to a problem? Please describe.

I have to read the csv files using a script and post them to some analytics db, this is often done repeatedly on a schedule. Every time I have to see what were the last records that were shipped, exclude them and post the new records to a web api or an analytics database.

Describe the solution you’d like

I would like to add a feature that posts data to a webhook, once the test statistics are ready. This will make it really convenient to collect and distribute stats, when locust is running in headless mode.

Locust currently have --csv, it would be nice to have another argument(--webhook) or event hook that can post that to a webhook url provided in the locust config.

Describe alternatives you’ve considered

Additional context

[cyberw]

Maybe use the test_stop event hook? http://docs.locust.io/en/stable/extending-locust.html

[cyberw]

I dont usually use the built in reporting at all (instead I use the events and send everything to a DB https://github.com/SvenskaSpel/locust-plugins/tree/master/locust_plugins/dashboards)

Making the reporting more composeable sounds good.