Telemetry handler for Tesla HTTP client instrumentation.

Attaches to Tesla telemetry events to track external HTTP requests:

• HTTP requests appear as "HTTP" type layers (External Services)
• Tracks URL, HTTP method, and response status code

Prerequisites

Your Tesla client must include the Telemetry middleware. Add it to your client:

defmodule MyApp.ApiClient do
  use Tesla

  plug Tesla.Middleware.Telemetry
  plug Tesla.Middleware.BaseUrl, "https://api.example.com"
  # ... other middleware
end

Important: Place Tesla.Middleware.Telemetry as close as possible to the end of the middleware stack to ensure accurate timing measurements.

Usage

In your application's start/2 function:

def start(_type, _args) do
  ScoutApm.Instruments.TeslaTelemetry.attach()
  # ... rest of supervision tree
end

What's Tracked

• Operation: HTTP/{method} (e.g., "HTTP/GET", "HTTP/POST")
• URL: The full URL of the request (sanitized)
• Status Code: The HTTP response status code

Configuration

Requests to Scout APM's own endpoints are automatically excluded from tracking.