telemetry-essentials

You attach telemetry handlers during Application.start to ensure they are registered exactly once at startup. This pattern prevents duplicate event registrations and provides consistent observability for Elixir and Phoenix apps.

Structured logging in Elixir attaches metadata to log entries to improve searchability and reduce ambiguity. Tagging metadata allows you to filter logs effectively while following safe production practices to avoid exposing sensitive data.

Capture Ecto and Phoenix telemetry events by integrating specific handler patterns that expose automated visibility into database queries and request lifecycle events. These patterns attach to standard Telemetry events for immediate metrics.

Phoenix LiveDashboard integration is guided for dev and stage environments to observe system health with minimal setup. For production, the patterns emphasize safe logging practices and metadata tagging rather than LiveDashboard exposure.

The best way to structure Elixir observability is applying consistent telemetry patterns across Phoenix apps, including Logger integration, Ecto event tracking, and attaching handlers at application startup to expose metrics through dashboards.