Documentation Grafana Cloud Connect to data sources Data sources Jaeger Troubleshooting

Troubleshoot Jaeger data source issues

This document provides solutions to common issues you may encounter when configuring or using the Jaeger data source. For configuration instructions, refer to Configure the Jaeger data source.

Connection errors

These errors occur when Grafana can’t reach the Jaeger instance.

“Connection refused” or timeout errors

Symptoms:

• Save & test fails with a connection error
• Queries fail with network errors
• Service and operation drop-downs don’t load

Possible causes and solutions:

“request failed: 404 Not Found”

Symptoms:

• Save & test returns a 404 error
• Queries fail with “request failed” messages

Solutions:

1. Verify the Jaeger URL doesn’t include a trailing path such as /api. The correct URL is the base endpoint, for example http://localhost:16686.
2. Confirm the Jaeger query service is running and listening on the expected port.
3. If using a reverse proxy, verify the proxy forwards requests to the correct Jaeger endpoint.

TLS errors

Symptoms:

• Certificate validation errors during Save & test
• Errors mentioning x509 or certificate verification

Solutions:

1. Verify your TLS certificates are valid and not expired.
2. Ensure the CA certificate is configured in the data source Additional settings if using a private CA.
3. For testing, you can temporarily toggle on Skip TLS verify in the data source settings. Don’t use this in production.
4. Verify the Server name setting matches the certificate’s Common Name or Subject Alternative Name.

Timeout errors

Symptoms:

• Queries take a long time then fail
• Errors mention timeout

Solutions:

1. Increase the timeout value in Additional settings > Timeout.
2. Verify network latency between Grafana and Jaeger is acceptable.
3. Check that the Jaeger query service isn’t overloaded.

Authentication errors

These errors occur when credentials are invalid or missing.

“401 Unauthorized” or “403 Forbidden”

Symptoms:

• Save & test fails with authorization errors
• Queries return access denied messages
• Services and operations don’t load in drop-downs

Possible causes and solutions:

Query errors

These errors occur when executing queries against Jaeger.

“traceID is empty”

Symptoms:

• The query fails with “traceID is empty” when using the TraceID query type

Solutions:

1. Enter a valid trace ID in the Trace ID field.
2. Verify the trace ID is a valid hexadecimal string.
3. If using a template variable, verify the variable resolves to a non-empty value.

No data in search results

Symptoms:

• Search query returns no traces
• The trace list is empty

Possible causes and solutions:

“The JSON file uploaded is not in a valid Jaeger format”

Symptoms:

• Importing a trace file fails with a format error

Solutions:

1. Verify the JSON file follows the Jaeger trace format with a data array at the root level.
2. Ensure the file contains at least one trace object in the data array.
3. Validate the JSON syntax using a JSON linter.

Expected format:

JSON Copy

{
  "data": [
    {
      "traceID": "<TRACE_ID>",
      "spans": [...],
      "processes": {...}
    }
  ]
}

Dependency graph errors

These errors relate to the dependency graph query type.

Empty dependency graph

Symptoms:

• The dependency graph query returns no nodes or edges
• The Node Graph panel is empty

Possible causes and solutions:

gRPC endpoint errors

These errors occur when using the gRPC query endpoint.

gRPC queries fail

Symptoms:

• Queries don’t use the gRPC endpoint
• Search, service, and operation queries still use the REST API

Solutions:

1. Verify the jaegerEnableGrpcEndpoint feature flag is enabled in Grafana. This feature is in public preview.
2. Grafana Cloud customers should contact support to request access.
3. Note that search and dependency graph queries currently use the REST endpoint even when the feature flag is enabled. Only service search, operation search, and trace ID queries use gRPC.

Enable debug logging

To capture detailed error information for troubleshooting:

1. Set the Grafana log level to debug in the configuration file:

   ini Copy

   [log]
   level = debug

2. Reproduce the issue.

3. Review logs in /var/log/grafana/grafana.log (or your configured log location).

4. Look for Jaeger-specific entries that include request URLs, response status codes, and error details.

5. Reset the log level to info after troubleshooting to avoid excessive log volume.

Get additional help

If you’ve tried the solutions in this document and still encounter issues:

1. Check the Grafana community forums for similar issues.
2. Review the Grafana GitHub issues for known bugs related to the Jaeger data source.
3. Refer to the Jaeger documentation for service-specific guidance.
4. Contact Grafana Support if you’re an Enterprise, Cloud Pro, or Cloud Advanced user.
5. When reporting issues, include:
   • Grafana version
   • Jaeger version
   • Error messages (redact sensitive information)
   • Steps to reproduce
   • Relevant data source configuration (redact credentials)