squash: add example

instrumentation/sinatra/example/config.ru

@@ -0,0 +1,51 @@
+#!/usr/bin/env ruby
+
+# frozen_string_literal: true
+
+# Copyright The OpenTelemetry Authors
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# Example rack application that manually manages tracer middleware
+
+require 'rubygems'
+require 'bundler/setup'
+
+Bundler.require
+
+ENV['OTEL_TRACES_EXPORTER'] = 'console'
+OpenTelemetry::SDK.configure do |c|
+  c.use_all({
+    'OpenTelemetry::Instrumentation::Rack' => { },
+    'OpenTelemetry::Instrumentation::Sinatra' => { install_rack: false }
+  })
+end
+
+# Example application for the Sinatra instrumentation
+class App < Sinatra::Base
+  set :show_exceptions, false
+
+  template :example_render do
+    'Example Render'
+  end
+
+  get '/example' do
+    'Sinatra Instrumentation Example'
+  end
+
+  # Uses `render` method
+  get '/example_render' do
+    erb :example_render
+  end
+
+  get '/thing/:id' do
+    'Thing 1'
+  end
+
+  get '/error' do
+    raise 'Panic!'
+  end
+end
+
+use(*OpenTelemetry::Instrumentation::Rack::Instrumentation.instance.middleware_args)
+run App