Your question is Monitoring and Alerting for HA. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How do you monitor system health and set up alerting thresholds for high-availability applications?
Address the practical execution approach, including the signals you would monitor, how thresholds would be established and tuned, how alerts would be prioritized, and how the operating team would respond. Explain how you would reduce alert fatigue while detecting failures early.