Heli Desai worked on enhancing observability within the opensearch-project/data-prepper repository by refactoring the OTLP sink metrics system. She standardized metric names to use dot notation, replacing the previous underscore format, and streamlined metric construction by leveraging the pluginMetrics instance for timers and summaries. This approach improved the consistency and readability of metrics, particularly in how response codes are recorded, making dashboards more intuitive for monitoring and alerting. Utilizing her expertise in backend development, metrics, and observability, and working primarily in Java, Heli’s contributions addressed the need for reliable, maintainable metric tracking across the OTLP pipeline during this development period.