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Critical Operations Must Emit Metrics

All business-critical operations (user registration, payment processing, data ingestion) must emit success/failure metrics and duration measurements using Micrometer, JMX MBeans, or custom metrics to enable monitoring of core business functions and detect issues before they impact users significantly.

External Dependencies Must Be Measured

All calls to external services, databases, or APIs must track error rates, response times, and timeout occurrences using Spring Boot Actuator, Micrometer Timer, or custom metrics to identify when external dependency issues are causing problems and establish SLA baselines.

Correlation IDs Must Be Propagated

Every incoming request must have or be assigned a correlation ID using Spring Cloud Sleuth, MDC (Mapped Diagnostic Context), or custom filters that gets passed to all downstream service calls and included in all related log messages to enable tracing requests across multiple services.

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