During February 2026, Dengke Liu enhanced secure observability in the pinterest/ray repository by addressing a critical issue with metrics export under TLS. He implemented TLS and mTLS configuration for the OpenTelemetry OTLP gRPC exporter, ensuring that metrics from C++ components such as raylet and gcs_server remained visible when TLS was enabled. Using C++, Bazel, and Python for testing, Dengke fixed a bug that previously caused loss of metrics due to improper certificate handling. His work involved patching the OpenTelemetry C++ SDK and updating build flags, resulting in restored metric visibility and end-to-end validation of secure metrics export functionality.