Add Splunk RUM custom workflow events for cart operations (#72)

* provide proper synch between image build and

* chore: update test manifests to demo-for-rob-1

Services: payment

Updated:

- Source k8s manifests with new image references

Note: .service-versions.yaml updated locally but not committed

* Test build: demo-for-rob-1

Generated test manifest for Astronomy Shop

- Base Version: 1.0.1 (unchanged)

- Test Version: demo-for-rob-1

- Manifest: kubernetes/TEST-splunk-astronomy-shop-demo-for-rob-1.yaml

- Generated by: GitHub Actions (test build)

Note: SPLUNK-VERSION file was NOT modified.

* chore: remove TEST manifest files

Automatically removed by remove-test-manifests workflow

* movd  Flagd. config map to a pvc, so bit flagd and flagd read write same file

* feat: add helper scripts for feature branch workflow

* verion 1.4.0 of values.yaml, mostly db-mon/sql focused

* feat: add custom version option for single-service builds

Added ability to specify a custom version when building a single service:
- New 'custom' option in version_bump dropdown
- New 'custom_version' text input for specifying exact version
- Validation ensures custom only works with single service (not 'all')
- Custom builds don't modify SPLUNK-VERSION (single service only)
- Clear PR title showing service and custom version

Also updated flagd-config to set paymentServiceUnreachable default to 50%

* fix: prevent 404 errors for undefined product images

Guard against rendering/fetching product images before data is loaded,
preventing requests to /images/products/undefined through frontend-proxy.

* First Cart Custome Events

* gitignore

* fix: improve CartPageError to fire once per session with realistic error

- Add useRef to ensure error only fires once per browser session
- Update error message to simulate pricing race condition
- Add detailed comments explaining the demo scenario
- Add error.synthetic attribute for filtering in Splunk

* chore: update test manifests to 1.4.1-b

Services: frontend

Updated:

- Source k8s manifests with new image references

Note: .service-versions.yaml updated locally but not committed

* fix: create deeper stack trace for CartPageError sourcemap support

Use actual function calls instead of new Error() to generate a real
stack trace that sourcemaps can map back to original source code.

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: hagen-p

src/frontend/frontend-k8s.yaml

@@ -47,7 +47,7 @@ spec:
       serviceAccountName: opentelemetry-demo
       containers:
       - name: frontend
-        image: ghcr.io/splunk/opentelemetry-demo/otel-frontend:1.4.0
+        image: ghcr.io/hagen-p/opentelemetry-demo-splunk/otel-frontend:1.4.1-b
         imagePullPolicy: Always
         ports:
         - containerPort: 8080

src/frontend/pages/cart/index.tsx

@@ -3,7 +3,7 @@
 
 import { NextPage } from 'next';
 import Head from 'next/head';
-import { useEffect } from 'react';
+import { useEffect, useRef } from 'react';
 import Layout from '../../components/Layout';
 import Recommendations from '../../components/Recommendations';
 import * as S from '../../styles/Cart.styled';
@@ -17,20 +17,64 @@ const Cart: NextPage = () => {
     cart: { items },
   } = useCart();
 
-  // Simulate a CartPageError workflow for Splunk RUM demo purposes
+  // ============================================================================
+  // DEMO: Synthetic CartPageError for Splunk RUM training
+  // ============================================================================
+  // This simulates a common race condition bug: trying to access cart item
+  // pricing data before the pricing service response is ready.
+  //
+  // In a real app, this could happen when:
+  //   - Component renders before async pricing data loads
+  //   - API response is delayed or partially loaded
+  //   - Cache miss causes undefined data access
+  //
+  // This error fires ONCE per browser session to demonstrate how JavaScript
+  // errors appear in Splunk RUM with stack traces and workflow attribution.
+  // ============================================================================
+  const cartErrorSentRef = useRef(false);
+
   useEffect(() => {
-    if (items.length > 0 && typeof window !== 'undefined' && (window as any).tracer) {
-      const tracer = (window as any).tracer;
-      const span = tracer.startSpan('CartPageError', {
-        attributes: {
-          'workflow.name': 'CartPageError',
-          'error': true,
-        },
-      });
-
-      console.error("Uncaught TypeError: Cannot read property 'Price' of undefined");
-      span.end();
+    // Only fire once per session, and only when cart has items
+    if (cartErrorSentRef.current || items.length === 0) return;
+    if (typeof window === 'undefined' || !(window as any).tracer) return;
+
+    cartErrorSentRef.current = true;
+
+    const tracer = (window as any).tracer;
+    const span = tracer.startSpan('CartPageError', {
+      attributes: {
+        'workflow.name': 'CartPageError',
+        'error': true,
+        'error.synthetic': true, // Mark as synthetic for filtering if needed
+      },
+    });
+
+    // Create functions to generate a realistic stack trace for sourcemap mapping
+    // These function names will appear in the stack trace in Splunk RUM
+    function getPricingData() {
+      const pricingResponse: any = undefined; // Simulates missing API response
+      return pricingResponse.unitPrice; // This throws TypeError
+    }
+
+    function calculateCartTotal() {
+      return getPricingData();
     }
+
+    function renderCartPricing() {
+      return calculateCartTotal();
+    }
+
+    try {
+      // Trigger the error through the call stack
+      renderCartPricing();
+    } catch (error) {
+      // Record on span - Splunk RUM will capture the full stack trace
+      span.recordException(error);
+      span.setStatus({ code: 2, message: (error as Error).message });
+      console.error('CartPageError: pricing race condition -', (error as Error).message);
+    }
+
+    span.end();
   }, [items.length]);
 
   return (