Ask HN: Continuous Deployment for the Front End?

Searching around I haven’t found many sources for the state of the art in frontend CD. I find myself wondering what others are doing for continuously deploying and monitoring web apps.

How often are you deploying your apps? Every commit? A few times a day?

How do you measure these deployments to make sure they are stable / non-breaking? How are you alerted when things go wrong?

Do you do ramp your deployments, or deploy to 100% of users at once?

How do you solve the problem of measuring low-volume flows, where it’s harder to tell if there’s been a drop off in conversion?

I’d love to know your experiences have been like, and any recommendations you might have.