A creative web application that generates OpenTelemetry metrics, traces, and logs for testing telemetry backends.

• Page Load Metrics: Tracks page loads with browser and referrer attributes
• Fortune Cookies: Serves developer-themed fortunes with custom counters
• Error Simulation: Randomly triggers different HTTP errors for alerting tests
• Slow Operations: Simulates multi-step operations with timing metrics
• Mood Tracking: Records user mood scores in a histogram
• Active Users: Tracks concurrent users with an up/down counter
• Auto-Refresh: Built-in page refresh options for continuous metric generation

1. Install dependencies:

npm install

2. Configure your OTLP endpoint (for Datadog, New Relic, Honeycomb, etc.):

# For Datadog
export OTEL_EXPORTER_OTLP_TRACES_ENDPOINT="https://trace.agent.datadoghq.com/v0.7/traces"
export OTEL_EXPORTER_OTLP_METRICS_ENDPOINT="https://api.datadoghq.com/v1/series"

# For New Relic
export OTEL_EXPORTER_OTLP_TRACES_ENDPOINT="https://otlp.nr-data.net:4318/v1/traces"
export OTEL_EXPORTER_OTLP_METRICS_ENDPOINT="https://otlp.nr-data.net:4318/v1/metrics"

# For Honeycomb
export OTEL_EXPORTER_OTLP_TRACES_ENDPOINT="https://api.honeycomb.io/v1/traces"
export OTEL_EXPORTER_OTLP_METRICS_ENDPOINT="https://api.honeycomb.io/v1/metrics"

3. Add your API key/headers as needed by your provider

4. Start the app:

npm start

5. Visit http://localhost:3000 and interact with the features!

• page_loads: Counter with browser and referrer labels
• http_request_duration: Histogram of request durations
• active_users: UpDown counter for concurrent users
• fortune_cookies_served: Counter with fortune type labels
• user_mood_score: Histogram of mood ratings (1-10)

Every endpoint creates spans with relevant attributes and events:

• Home page loads
• Fortune cookie selections
• Error simulations
• Slow operation steps
• Mood recordings