This guide shows you how to instrument your DBOS application with OpenTelemetry and send telemetry to SigNoz. With OTLP enabled, DBOS can export traces and logs. DBOS automatically constructs hierarchical traces for workflows and their steps, and traces each HTTP request if you use FastAPI or Flask.
Prerequisites
Python 3.10+
- An instance of SigNoz (either Cloud or Self-Hosted)
- A DBOS application
Tested with Python 3.13 and DBOS version 2.17.0.
Send telemetry to SigNoz
Step 1. Install DBOS OpenTelemetry dependencies
pip install "dbos[otel]"
Step 2. Enable OpenTelemetry export in DBOS
In your Python application code, update the DBOSConfig object you pass to DBOS. Enable OTLP export and set both the traces and logs endpoints:
from dbos import DBOS, DBOSConfig
config: DBOSConfig = {
"name": "<service-name>",
"enable_otlp": True,
"otlp_traces_endpoints": ["https://ingest.<region>.signoz.cloud:443/v1/traces"],
"otlp_logs_endpoints": ["https://ingest.<region>.signoz.cloud:443/v1/logs"],
}
DBOS(config=config)
Verify these values:
<service-name>: A descriptive name for your service (e.g.,payment-service)<region>: Your SigNoz Cloud region
Step 3. Set environment variables and run
Step 3.1 Set the ingestion key environment variable
Set the ingestion key in your shell before you start the application. The OpenTelemetry SDK used by DBOS reads authentication headers from this environment variable at runtime:
export OTEL_EXPORTER_OTLP_HEADERS="signoz-ingestion-key=<your-ingestion-key>"
Verify these values:
<your-ingestion-key>: Your SigNoz ingestion key
Step 3.2 Start your application
Choose the startup command that matches your app:
- If you use FastAPI, start your ASGI app with
uvicorn. - If you use Flask, start the app with the WSGI or ASGI server command you already use in that project.
- If you use plain DBOS without a web framework, start it with
dbos start.
Example for a FastAPI app:
uvicorn main:app --host 0.0.0.0 --port 8000
Example for a plain DBOS app:
dbos start
Step 3.3 Generate a little traffic
After the app starts, trigger one workflow run or send one HTTP request. SigNoz needs live traffic before traces and logs appear.
Step 3.1 Set the ingestion key environment variable
Set the ingestion key in PowerShell before you start the application:
$env:OTEL_EXPORTER_OTLP_HEADERS="signoz-ingestion-key=<your-ingestion-key>"
Verify these values:
<your-ingestion-key>: Your SigNoz ingestion key
Step 3.2 Start your application
Choose the startup command that matches your app:
- If you use FastAPI, start your ASGI app with
uvicorn. - If you use Flask, start the app with the WSGI or ASGI server command you already use in that project.
- If you use plain DBOS without a web framework, start it with
dbos start.
Example for a FastAPI app:
uvicorn main:app --host 0.0.0.0 --port 8000
Example for a plain DBOS app:
dbos start
Step 3.3 Generate a little traffic
After the app starts, trigger one workflow run or send one HTTP request so DBOS can emit traces and logs.
Step 3.1 Store the ingestion key in a Kubernetes Secret
Create a Secret, then reference it from your deployment. This keeps the ingestion key out of your manifest:
kubectl create secret generic signoz-otlp \
--from-literal=OTEL_EXPORTER_OTLP_HEADERS="signoz-ingestion-key=<your-ingestion-key>"
Verify these values:
<your-ingestion-key>: Your SigNoz ingestion key
Step 3.2 Reference the Secret in your deployment manifest
env:
- name: OTEL_EXPORTER_OTLP_HEADERS
valueFrom:
secretKeyRef:
name: signoz-otlp
key: OTEL_EXPORTER_OTLP_HEADERS
Step 3.3 Apply the updated manifest and generate traffic
Redeploy your workload, then invoke one workflow or HTTP endpoint so DBOS exports traces and logs.
Step 3.1 Keep the ingestion key outside the image
Do not bake the ingestion key into your Dockerfile. Pass it at runtime.
If you use docker-compose.yml, reference a host environment variable:
environment:
- OTEL_EXPORTER_OTLP_HEADERS=${OTEL_EXPORTER_OTLP_HEADERS}
Verify these values:
<your-ingestion-key>: Your SigNoz ingestion key
Step 3.2 Set the environment variable in your shell
export OTEL_EXPORTER_OTLP_HEADERS="signoz-ingestion-key=<your-ingestion-key>"
Step 3.3 Build and run your container
docker build -t my-dbos-app .
docker run \
-p 8000:8000 \
-e OTEL_EXPORTER_OTLP_HEADERS="$OTEL_EXPORTER_OTLP_HEADERS" \
my-dbos-app
Step 3.4 Generate a little traffic
After the container starts, invoke one workflow or HTTP endpoint so SigNoz receives sample traces and logs.
Validate
After you start the application and generate traffic, confirm that SigNoz receives both traces and logs.
Validate traces
- Invoke a workflow or send one HTTP request to your DBOS application.
- In SigNoz, open APM > Services.
- Select your service name (
<service-name>) from the service list. - Open the Traces tab.
- Confirm that SigNoz shows traces for your request.
- Open one trace and confirm that it contains the workflow and step spans you expect.
Validate logs
- Open Logs Explorer in SigNoz.
- Filter logs by
service.nameusing your configured service name (<service-name>). - Confirm that SigNoz shows logs from your DBOS application.
- Open one log entry and confirm that it matches the request or workflow run you just triggered.
Troubleshooting
No telemetry appearing in SigNoz
- Likely cause: OTLP is not enabled in the DBOS configuration.
- Fix: Confirm
enable_otlp: Trueis set in yourDBOSConfigand that both OTLP endpoints are present. - Verify: Traces and logs appear in SigNoz within a few minutes after enabling.
Authentication errors
- Likely cause: Missing or incorrect ingestion key.
- Fix: Set the
signoz-ingestion-keyheader inOTEL_EXPORTER_OTLP_HEADERSand verify the key is active in SigNoz Cloud ingestion keys. - Verify: Check that the environment variable is exported before starting the process.
"OTLP tracer/logger provider not set, skipping exporter setup" warnings
- Likely cause: The module failed to load before DBOS could register providers, or the uvicorn module path doesn't match the actual filename.
- Fix: Ensure the module name in the uvicorn command matches your filename exactly (e.g.,
uvicorn main:appformain.py,uvicorn myapp:appformyapp.py). - Verify: Warnings are absent in the startup logs after the fix.
Traces missing workflow spans
- Likely cause: Functions are not decorated as DBOS workflows.
- Fix: Ensure functions are decorated with
@DBOS.workflow()or@DBOS.step(). - Verify: DBOS only creates spans for decorated workflow and step functions.
Logs not appearing in SigNoz
- Likely cause: Your app has not emitted any logs since startup.
- Fix: Trigger one request or workflow run that writes logs, then check Logs Explorer again.
- Verify: Filter by
service.nameand confirm that new DBOS log entries appear.
Setup OpenTelemetry Collector (Optional)
Use the OpenTelemetry Collector when you need to process, filter, or route telemetry before it reaches SigNoz. Follow the Switch to Collector guide for setup instructions.
For DBOS, point the OTLP endpoints to your collector:
config: DBOSConfig = {
"name": "<service-name>",
"enable_otlp": True,
"otlp_traces_endpoints": ["http://<collector-host>:4318/v1/traces"],
"otlp_logs_endpoints": ["http://<collector-host>:4318/v1/logs"],
}
Next steps
- Set up alerts for trace latency, error rates, or log-based conditions.
- Build dashboards to monitor DBOS workflow activity.
- Learn about manual instrumentation in Python to add custom spans and attributes.
Get Help
If you need help with the steps in this topic, please reach out to us on SigNoz Community Slack.
If you are a SigNoz Cloud user, please use in product chat support located at the bottom right corner of your SigNoz instance or contact us at cloud-support@signoz.io.
