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, 17 insertions, 7 deletions

diff --git a/tests/specs/cli/otel_basic/basic.ts b/tests/specs/cli/otel_basic/basic.ts
index 5a178794a..5c4ae43cd 100644
--- a/tests/specs/cli/otel_basic/basic.ts
+++ b/tests/specs/cli/otel_basic/basic.ts
@@ -1,10 +1,17 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 
+import { trace } from "npm:@opentelemetry/api@1.9.0";
+import "jsr:@deno/otel@0.0.2/register";
+
+const tracer = trace.getTracer("example-tracer");
+
 async function inner() {
-  using _span = new Deno.tracing.Span("inner span");
-  console.log("log 1");
-  await 1;
-  console.log("log 2");
+  await tracer.startActiveSpan("inner span", async (span) => {
+    console.log("log 1");
+    await 1;
+    console.log("log 2");
+    span.end();
+  });
 }
 
 const server = Deno.serve({
@@ -17,8 +24,11 @@ const server = Deno.serve({
     }
   },
   handler: async (_req) => {
-    using _span = new Deno.tracing.Span("outer span");
-    await inner();
-    return new Response(null, { status: 200 });
+    return await tracer.startActiveSpan("outer span", async (span) => {
+      await inner();
+      const resp = new Response(null, { status: 200 });
+      span.end();
+      return resp;
+    });
   },
 });