From 82e03978b89938219958032efb1448cc76baa181 Mon Sep 17 00:00:00 2001
From: Saumit <justsaumit@protonmail.com>
Date: Sat, 27 Sep 2025 02:14:26 +0530
Subject: Initial snapshot - OpenTelemetry demo 2.1.3 -f

---
 src/frontend/utils/telemetry/FrontendTracer.ts | 72 ++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/frontend/utils/telemetry/FrontendTracer.ts

(limited to 'src/frontend/utils/telemetry/FrontendTracer.ts')

diff --git a/src/frontend/utils/telemetry/FrontendTracer.ts b/src/frontend/utils/telemetry/FrontendTracer.ts
new file mode 100644
index 0000000..d52412c
--- /dev/null
+++ b/src/frontend/utils/telemetry/FrontendTracer.ts
@@ -0,0 +1,72 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+import { CompositePropagator, W3CBaggagePropagator, W3CTraceContextPropagator } from '@opentelemetry/core';
+import { WebTracerProvider } from '@opentelemetry/sdk-trace-web';
+import { BatchSpanProcessor } from '@opentelemetry/sdk-trace-base';
+import { registerInstrumentations } from '@opentelemetry/instrumentation';
+import { getWebAutoInstrumentations } from '@opentelemetry/auto-instrumentations-web';
+import { resourceFromAttributes, detectResources } from '@opentelemetry/resources';
+import { browserDetector } from '@opentelemetry/opentelemetry-browser-detector';
+import { ATTR_SERVICE_NAME } from '@opentelemetry/semantic-conventions';
+import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-http';
+import { SessionIdProcessor } from './SessionIdProcessor';
+
+const {
+  NEXT_PUBLIC_OTEL_SERVICE_NAME = '',
+  NEXT_PUBLIC_OTEL_EXPORTER_OTLP_TRACES_ENDPOINT = '',
+  IS_SYNTHETIC_REQUEST = '',
+} = typeof window !== 'undefined' ? window.ENV : {};
+
+const FrontendTracer = async () => {
+  const { ZoneContextManager } = await import('@opentelemetry/context-zone');
+
+  let resource = resourceFromAttributes({
+    [ATTR_SERVICE_NAME]: NEXT_PUBLIC_OTEL_SERVICE_NAME,
+  });
+  const detectedResources = detectResources({detectors: [browserDetector]});
+  resource = resource.merge(detectedResources);
+
+  const provider = new WebTracerProvider({
+    resource,
+    spanProcessors: [
+      new SessionIdProcessor(),
+      new BatchSpanProcessor(
+          new OTLPTraceExporter({
+            url: NEXT_PUBLIC_OTEL_EXPORTER_OTLP_TRACES_ENDPOINT || 'http://localhost:4318/v1/traces',
+          }),
+          {
+            scheduledDelayMillis: 500,
+          }
+      ),
+    ],
+  });
+
+  const contextManager = new ZoneContextManager();
+
+  provider.register({
+    contextManager,
+    propagator: new CompositePropagator({
+      propagators: [
+        new W3CBaggagePropagator(),
+        new W3CTraceContextPropagator()],
+    }),
+  });
+
+  registerInstrumentations({
+    tracerProvider: provider,
+    instrumentations: [
+      getWebAutoInstrumentations({
+        '@opentelemetry/instrumentation-fetch': {
+          propagateTraceHeaderCorsUrls: /.*/,
+          clearTimingResources: true,
+          applyCustomAttributesOnSpan(span) {
+            span.setAttribute('app.synthetic_request', IS_SYNTHETIC_REQUEST);
+          },
+        },
+      }),
+    ],
+  });
+};
+
+export default FrontendTracer;
-- 
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