Mention a few of the cross-cutting concerns that we need to implement for any microservice.

• Security - for example, REST APIs must be secured by requiring an Access Token,
• Externalized configuration - includes credentials, and network locations of external services such as databases and message brokers,
• Logging - configuring of a logging framework such as log4j or logback,
• Health check - a url that a monitoring service can "ping" to determine the health of the application,
• Metrics - measurements that provide insight into what the application is doing and how it is performing,
• Distributed tracing - instrument services with code that assigns each external request an unique identifier that is passed between services.

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