Contributed to the apache/flink repository by developing JVM File Descriptor Metrics to enhance system observability and resource planning. This work introduced new metrics, Status.FileDescriptor.Max and Status.FileDescriptor.Open, enabling Flink to track file descriptor usage within the JVM. The implementation involved wiring metric creation into MetricUtils.java and ensuring reliability through comprehensive tests in MetricUtilsTest.java. Documentation was updated to describe the new metrics, supporting users in monitoring system resources more effectively. The feature was delivered using Java and Markdown, leveraging skills in system monitoring and metrics instrumentation to provide deeper insights into JVM resource consumption for Flink deployments.