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Which three signals together typically form a modern observability stack for a distributed system?
ARAID levels, fan speeds, and air temperature
BSource code, documentation, and product roadmap
CMetrics, logs, and traces (sometimes plus events / profiles)
DCron jobs, email alerts, and database backups
Answer & Solution
Correct answer: C. Metrics, logs, and traces (sometimes plus events / profiles)
Modern observability = metrics + logs + traces (the "three pillars"); often supplemented with continuous profiling and events. The other options are operations or hardware concerns.
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