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Discover how to seamlessly integrate `Trace ID` in your logs when using Micrometer Tracing in your Spring Boot microservice application.
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How to Include Trace ID in Logs for Your Spring Boot Microservice Using Micrometer Tracing

In the world of microservices, observability is crucial. One of the important aspects of observability is tracing requests throughout your distributed system. When working on a Spring Boot application, you might encounter situations where logs generated by your application do not include the Trace ID. This can make it challenging to track requests and diagnose issues. In this post, we'll address this common problem and guide you on how to include the Trace ID in your logs using Micrometer Tracing.

Understanding the Problem

Your microservice application, built with Spring Boot, is set up to use the Micrometer tracing library. However, you notice that when logs are printed, the Trace ID is missing. This information is vital for debugging and has implications for the overall monitoring strategy of your application.

Solution Overview

To include the Trace ID in your application logs, you need to ensure a few key components are correctly configured in your Spring Boot setup. Below are the essential steps to achieve this:

1. Add the Required Dependency

The first step is to include the missing dependency that provides the necessary tracing functionalities. Specifically, you need to add the spring-boot-starter-actuator dependency to your project's pom.xml file. The actuator module contains various management features, including the ObservationAutoConfiguration, which is crucial for tracing.

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2. Update the pom.xml

Ensure your pom.xml resembles the following after adding the actuator dependency:

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3. Configure Log Settings

Next, you need to modify your logging configuration to include the Trace ID. You can update the application.yml configuration file by adjusting the logging pattern to specify the traceId and spanId. Here’s how to do that:

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This configuration tells Spring Boot to log the Trace ID and Span ID in the specified format. The default value :- ensures that if the Trace ID or Span ID is not available, it won't lead to errors or undefined behavior.

4. Verify the Configuration

After making the above changes, restart your Spring Boot application. It’s essential to monitor the application logs now to confirm that the Trace ID appears as expected. You should see entries in your logs that reflect the Trace ID alongside your application’s logging details.

Conclusion

By following these steps, you can successfully include the Trace ID in your application logs when using Micrometer Tracing in a Spring Boot microservices application. This addition significantly enhances your ability to debug and diagnose issues by providing more context in your logs.

If you encounter any further challenges or have additional questions, don’t hesitate to reach out or consult the official Spring documentation for more insights! Happy coding!