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Logfire Setup

The simplest Logfire setup uses:
  • LogfireConfig
  • LogfireExporter
  • Telemetry

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Minimal Example

use Cognesy\Telemetry\Adapters\Logfire\LogfireConfig;
use Cognesy\Telemetry\Adapters\Logfire\LogfireExporter;
use Cognesy\Telemetry\Application\Registry\TraceRegistry;
use Cognesy\Telemetry\Application\Telemetry;

$telemetry = new Telemetry(
    registry: new TraceRegistry(),
    exporter: new LogfireExporter(new LogfireConfig(
        endpoint: 'https://logfire-eu.pydantic.dev',
        serviceName: 'my-service',
        headers: ['Authorization' => $_ENV['LOGFIRE_TOKEN']],
    )),
);
// @doctest id="03e7"

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Environment Variables

The example helpers look for:
  • LOGFIRE_TOKEN
  • LOGFIRE_API_TOKEN
  • LOGFIRE_OTLP_ENDPOINT
  • LOGFIRE_BASE_URL
See:
  • examples/_support/logfire.php

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Endpoint Rule

LogfireConfig expects the OTLP base endpoint. Do not pass a full /v1/traces or /v1/metrics path. The helper in examples/_support/logfire.php strips those suffixes if present.

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Agent Runtime Example

The working agent example is:
  • examples/D05_AgentTroubleshooting/TelemetryLogfire/run.php

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Subagent Example

For nested parent and child traces, see:
  • examples/D05_AgentTroubleshooting/SubagentTelemetryLogfire/run.php

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Notes

  • LogfireExporter requires either LogfireConfig or a custom transport
  • service name comes from LogfireConfig::serviceName()
  • if export fails with a 4xx response, check the token and endpoint first