Send Cloudflare Workers Logs to SigNoz

Cloudflare Workers supports exporting OpenTelemetry (OTel)-compliant logs directly to SigNoz without code changes, using Cloudflare's built-in observability features.

When combined with trace instrumentation, logs can be correlated with traces for complete observability. See Cloudflare Workers OpenTelemetry Instrumentation to set up traces.

Prerequisites

• Cloudflare Workers Paid plan or higher
• Wrangler CLI

Step 1: Create destination in Cloudflare

1. Go to Workers Observability in your Cloudflare dashboard
2. Click on Destinations Tab
3. Click Add destination
4. Configure:
   • Name: Choose a name (e.g., signoz-logs)
   • Type: Logs
   • OTLP Endpoint:
     • https://ingest.<region>.signoz.cloud:443/v1/logs
     • See SigNoz Ingestion Docs
   • Headers:
     • Add signoz-ingestion-key: <your-ingestion-key>
5. Click Save

Step 2: Configure Wrangler

Update wrangler.jsonc ( use the destination name created in Step 1 ):

{
  "observability": {
    "logs": {
      "enabled": true,
      "destinations": ["signoz-logs"]
    }
  }
}

Additional configuration options:

You can customize the configuration with additional options such as:

• head_sampling_rate: Control sampling rate for logs
• persist: false: Disable storing data in Cloudflare dashboard (only send to SigNoz)

For complete configuration options, refer to Cloudflare's OpenTelemetry documentation.

Step 3: Deploy

Run wrangler deploy. Logs will appear in SigNoz within minutes.

Validate

After deploying your Worker, verify that logs are being sent to SigNoz:

1. Access SigNoz UI and generate logs: Navigate to the Logs tab in your SigNoz dashboard and trigger your Cloudflare Worker to generate log output (e.g., console.log() statements)
2. View logs: Within a few minutes, logs from your Worker should appear in the Logs view

Expected behavior: You should see logs with attributes like worker_name, script_name, and any custom fields from your Worker code.

You can click on a particular log entry in the Logs view to get the detailed view of the Cloudflare Worker log as shown below.

Troubleshooting

Logs not appearing in SigNoz

Symptom: No logs visible in SigNoz UI after deploying the Worker.

Things to investigate:

1. Check destination status

   • In your Cloudflare dashboard under Workers Observability > Destinations, verify the status:
     • Last: n minutes ago - Data is being delivered successfully
     • Never run - No data has been delivered yet (check if your Worker is receiving traffic or review sampling rates)
     • Error - Delivery failed (verify OTLP endpoint and authentication headers)

2. Incorrect OTLP endpoint

   • Wrong region or endpoint format
   • Verify the endpoint matches your SigNoz setup: SigNoz Ingestion Docs

3. Missing or invalid ingestion key

   • Incorrect or missing signoz-ingestion-key header
   • Copy the correct ingestion key from SigNoz settings and update the destination header

4. Worker not receiving traffic

   • No requests to the Worker means no logs generated
   • Send test requests to your Worker endpoint and ensure it has console.log() or similar logging statements

5. Network/connectivity issues

   • Firewall or network blocking OTLP traffic
   • Verify your OTel collector is accessible from Cloudflare Workers

Next steps

• Set up traces: Correlate logs with traces by setting up Cloudflare Workers trace instrumentation
• Query logs: Use the Logs Explorer to search and filter your Worker logs
• Create alerts: Set up alerts based on log patterns to monitor Worker issues
• Build dashboards: Create custom dashboards combining logs and traces for complete observability

Limitations

• Beta status: OpenTelemetry data export from Cloudflare Workers is in beta. Features may change.
• Limited log types: Currently only application logs (including console.log() output) and system-generated logs are supported. For more information please refer to Cloudflare Workers official OpenTelemetry Docs