A built-in telemetry handler that logs FRED API request details using Elixir's Logger.

Attach it in your application's start/2 callback for quick observability:

def start(_type, _args) do
  Fred.Telemetry.Logger.attach()

  # ...
end

Output

On every completed request (:stop event) it logs at the configured level:

[fred] GET /series/observations - 200 in 142ms (params: [series_id: "UNRATE", frequency: :m])

On errors:

[fred] GET /series/observations - error in 83ms: (400) Bad Request (params: [series_id: ""])

On exceptions (:exception event):

[fred] GET /series/observations - exception in 5012ms: %Req.TransportError{reason: :timeout}

Configuration

Pass options to attach/1 to customize behavior:

Fred.Telemetry.Logger.attach(
  level: :info,              # Logger level (default: :info)
  handler_id: "my-fred-log"  # Unique handler ID (default: "fred-default-logger")
)

Detaching

To stop logging, detach by handler ID:

Fred.Telemetry.Logger.detach()

# or with a custom ID:

Fred.Telemetry.Logger.detach("my-fred-log")