Design a metrics monitoring platform that collects performance data (CPU, memory, throughput) from hundreds of thousands of servers, allows users to set threshold-based alerts, and provides dashboards for visualization and notifications when alerts are triggered.
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The interviewer wasn't expecting any kind of notifications or alerting system to be designed. Just collecting data from around 300k hosts every minute and being able to view that on the client side by a small internal team.
Design a system metrics monitoring platform for a large-scale system. The company operates hundreds of thousands of hosts across multiple data centers. Each host emits system and service metrics such as CPU, memory usage, latency, and error rates. The system should reliably collect these metrics, store historical data, and allow engineers to query metrics and set up alerts to monitor system health and troubleshoot issues. Focus on high-level architecture, scalability, and reliability. You do not need to design the UI or go into low-level implementation details.
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