feat!: migrate metrics/tracing pipeline to OpenTelemetry SDK#679
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Adds a new optional metrics integration that exports the Relay Proxy's existing OpenCensus stats views and trace spans via OTLP, using the official go.opentelemetry.io/otel/bridge/opencensus bridge. The exporter sits alongside the existing Datadog, Stackdriver, and Prometheus exporters and can be enabled with USE_OPENTELEMETRY=true. gRPC (default) and HTTP/protobuf transports are both supported, and the standard OTEL_EXPORTER_OTLP_* environment variables are honored. Closes launchdarkly#582.
Replaces the three OpenCensus exporter modules with native OpenTelemetry SDK exporters and unifies them under a single MeterProvider and TracerProvider. The deprecated dependencies DataDog/opencensus-go-exporter-datadog, launchdarkly/opencensus-go-exporter-stackdriver, and contrib.go.opencensus.io/exporter/prometheus have all been removed. - Datadog: ships metrics and traces via OTLP gRPC into the local Datadog Agent's OTLP receiver (requires Agent v7.43+ with otlp_config enabled). DATADOG_TRACE_ADDR is now the OTLP endpoint; DATADOG_STATS_ADDR is logged as deprecated and ignored. Tags become OpenTelemetry resource attributes. - Stackdriver: uses the official Google Cloud OpenTelemetry exporters for metrics and traces. - Prometheus: backed by go.opentelemetry.io/otel/exporters/prometheus on the same /metrics endpoint and port. The OpenCensus-to-OpenTelemetry bridge is installed once at startup so that Relay's existing OpenCensus-based instrumentation continues to feed every configured backend with no behavioral change. Adds otelmux middleware on the gorilla/mux router so every inbound request produces an OpenTelemetry span named after the matched route template. BREAKING CHANGE: Datadog deployments must now run a local Datadog Agent v7.43+ with the OTLP receiver enabled. See docs/metrics.md for migration notes for each backend.
Updated breaking change notes for Relay Proxy version 9 regarding the OpenTelemetry SDK and removal of OpenCensus exporters.
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