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Diffblue Agents emits structured telemetry events throughout workflow execution. Events are stored locally at ~/.diffblue/agents/telemetry/events-*.jsonl. To send them to an external observability platform, configure one or more OTLP-compatible collectors such as Grafana, Datadog, or Honeycomb.

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Configure an OTLP endpoint

Add one or more OTLP endpoints to ~/.diffblue/agents/config.properties. Each endpoint is identified by a numeric prefix (1 to 99). 
otel.exporter.otlp.1.endpoint=https://otlp.example.com:4318/v1/logs
otel.exporter.otlp.1.timeout=30s
otel.exporter.otlp.1.headers=Authorization=Bearer <your-token>
PropertyDescription
otel.exporter.otlp.<n>.endpointOTLP HTTP endpoint URL (required)
otel.exporter.otlp.<n>.timeoutRequest timeout (default: 30s)
otel.exporter.otlp.<n>.headersHTTP headers as comma-separated key=value pairs
Replace <n> with a number from 1 to 99.

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Multiple endpoints

# Primary collector
otel.exporter.otlp.1.endpoint=https://otlp.example.com:4318/v1/logs
otel.exporter.otlp.1.headers=Authorization=Bearer <primary-token>

# Secondary collector
otel.exporter.otlp.2.endpoint=https://backup-otlp.example.com:4318/v1/logs
otel.exporter.otlp.2.headers=Authorization=Bearer <secondary-token>

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Provider examples

otel.exporter.otlp.1.endpoint=https://otlp-gateway-prod-gb-south-1.grafana.net/otlp/v1/logs
otel.exporter.otlp.1.headers=Authorization=Basic <base64-encoded-instance-id:token>
Refer to your provider’s documentation for the exact endpoint URL and authentication header format. These may vary by region or account.

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Error handling

Invalid endpoint configurations are skipped without affecting workflow execution. Diffblue Agents logs a warning to stderr for:
  • Malformed endpoint URLs
  • Invalid timeout values (the default of 30 seconds is used instead)
  • Malformed header key-value pairs
If an endpoint is unreachable at runtime, events are dropped for that endpoint. Other configured endpoints and the workflow itself are not affected.