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Systematically investigate a spike in 5xx errors across a microservice architecture, from initial alert to root cause identification, using structured debugging methodology.
## Problem
You are on-call and receive a PagerDuty alert: your team's API service is returning a 15% error rate (5xx responses), up from the normal baseline of 0.1%. Walk through your investigation process from the moment you receive the alert to identifying the root cause.
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