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An SRE team is designing observability for a microservices platform and wants to make the source of problems easier to identify across service boundaries. Which of the three pillars most directly supports pinpointing the source of a problem in a distributed system?

A Metrics, because they aggregate numeric system health
B Logs, because they store discrete event records
C Traces, because they reveal the source of the problem across distributed services
D Topology, because it maps infrastructure dependencies

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