feat(runtime): remove public OTEL trace API (#26854)

This PR removes the public Deno.tracing.Span API.
We are not confident we can ship an API that is
better than the `@opentelemetry/api` API, because
V8 CPED does not support us using `using` to
manage span context. If this changes, we can
revisit this decision. For now, users wanting
custom spans can instrument their code using
the `@opentelemetry/api` API and `@deno/otel`.

This PR also speeds up the OTEL trace generation
by a 30% by using Uint8Array instead of
strings for the trace ID and span ID.

1 files changed, 38 insertions, 0 deletions

diff --git a/tests/registry/jsr/@deno/otel/0.0.2/src/index.ts b/tests/registry/jsr/@deno/otel/0.0.2/src/index.ts
new file mode 100644
index 000000000..9c4445783
--- /dev/null
+++ b/tests/registry/jsr/@deno/otel/0.0.2/src/index.ts
@@ -0,0 +1,38 @@
+// Copyright 2024-2024 the Deno authors. All rights reserved. MIT license.
+
+import { context } from "npm:@opentelemetry/api@1";
+import {
+  BasicTracerProvider,
+  SimpleSpanProcessor,
+} from "npm:@opentelemetry/sdk-trace-base@1";
+
+// @ts-ignore Deno.telemetry is not typed yet
+const telemetry = Deno.telemetry ?? Deno.tracing;
+
+let COUNTER = 1;
+
+/**
+ * Register `Deno.telemetry` with the OpenTelemetry library.
+ */
+export function register() {
+  context.setGlobalContextManager(
+    new telemetry.ContextManager() ?? telemetry.ContextManager(),
+  );
+
+  const provider = new BasicTracerProvider({
+    idGenerator: Deno.env.get("DENO_UNSTABLE_OTEL_DETERMINISTIC") === "1" ? {
+      generateSpanId() {
+        return "1" + String(COUNTER++).padStart(15, "0");
+      },
+      generateTraceId() {
+        return "1" + String(COUNTER++).padStart(31, "0");
+      }
+    } : undefined
+  });
+
+  // @ts-ignore Deno.tracing is not typed yet
+  const exporter = new telemetry.SpanExporter();
+  provider.addSpanProcessor(new SimpleSpanProcessor(exporter));
+
+  provider.register();
+}