I run Selenium integration tests inside a docker container every 5 minutes or so and attach the results to a sentry.io logger. I put up a boilerplate version on github: https://github.com/mikedh/selenium-simple
This is almost literally what I used as an inspiration for the site transaction monitoring part of https://checklyhq.com, as in a browser emulation feeding a monitoring system at regular intervals. Selenium was always a bit of hog so I jumped on Puppeteer when it came around.