You're in charge of a website. Or two. Or a dozen. Or several thousand.
In any case, you're "responsible for the health of the service".
What does that mean? How can you, your team, your leadership, or your stakeholders quantify that?
(Spoiler alert: I don't know the answer)
Nevertheless, I can discuss how we at Stanford Web Services track metrics across the following dimensions to try to keep a grasp on the "health of the service":