Developed dynamic metric tagging capabilities for the spring-projects/spring-boot repository, enabling the use of the @MeterTag annotation alongside existing @Timed and @Counted annotations. Leveraged Aspect-Oriented Programming and Java to introduce the SpelTagValueExpressionResolver, which was integrated with CountedAspect and TimedAspect to support expression-based tag values at runtime. This approach enhanced observability by allowing flexible, context-driven metric tags, supporting more granular analytics and performance monitoring. Comprehensive tests were added to validate dynamic tagging behavior and ensure regression coverage. The work focused on Spring Boot’s metrics module, utilizing technologies such as Micrometer, Spring AOP, and SpEL expressions.