Know it's broken before they tell you.
Once it's live, you need to know when it goes down, when it errors and whether anyone uses it. Three simple kinds of monitoring.
Uptime
Is It Up?
Checks the site every few minutes.
Alerts you if it stops answering.
Errors
Is It Failing?
Collects crashes and error messages.
Shows how often and where.
Usage
Is It Used?
Which features get used, and how often.
No personal data needed.
One alert. One owner. One action.