Relay Proxy is moving its observability stack from vendor-specific integrations to the OpenTelemetry standard, with v9.0.0-rc.2 completing that migration. The RC replaced OpenCensus with OpenTelemetry and removed direct Datadog, Stackdriver, and Prometheus config sections in favor of a unified [OpenTelemetry] block using OTLP, along with metric name changes to follow OTEL semantic conventions—connections became http.server.active_requests, and requests replaced by http.server.request.duration histogram. On the v8 stable branch, recent releases added per-endpoint request duration metrics, structured JSON logging support, offline mode capability, and environment-specific status endpoints, while routine maintenance included Go version bumps and gRPC dependency updates.