PagerDuty:?

Short answer: An incident management system that integrates with monitoring tools and notifies on-call personnel based on alerts. Example: Use Prometheus to monitor metrics such as CPU usage, request rate, and error rates, while Grafana can visualize them on a dashboard and set alerts for anomalies.

Real-world example (ShopNest)

ShopNest splits Catalog, Cart, Order, and Payment into services so teams can deploy catalog changes without redeploying payments.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.