feat: add option to allow user format the version from path in grape

instrumentation/grape/lib/opentelemetry/instrumentation/grape/event_handler.rb

@@ -93,7 +93,8 @@ def path(endpoint)
             return '' unless endpoint.routes
 
             namespace = endpoint.routes.first.namespace
-            version = endpoint.routes.first.options[:version]&.to_s
+            version = endpoint.routes.first.options[:version]
+            version = config[:version_format].call(version)
             prefix = endpoint.routes.first.options[:prefix]&.to_s
             parts = [prefix, version] + namespace.split('/') + endpoint.options[:path]
             parts.reject { |p| p.nil? || p.empty? || p.eql?('/') }.join('/').prepend('/')
@@ -110,6 +111,10 @@ def formatter_type(formatter)
           def built_in_grape_formatter?(formatter)
             formatter.respond_to?(:name) && formatter.name.include?('Grape::Formatter')
           end
+
+          def config
+            Grape::Instrumentation.instance.config
+          end
         end
       end
     end

instrumentation/grape/lib/opentelemetry/instrumentation/grape/instrumentation.rb

@@ -38,6 +38,7 @@ class Instrumentation < OpenTelemetry::Instrumentation::Base
 
         option :ignored_events, default: [], validate: :array
         option :install_rack, default: true, validate: :boolean
+        option :version_format, default: ->(version) { version&.to_s }, validate: :callable
 
         private
 

instrumentation/grape/test/opentelemetry/instrumentation/grape_test.rb

@@ -469,5 +469,76 @@ class BasicAPI < Grape::API
         end
       end
     end
+
+    describe 'when with multiple version in api' do
+      class BasicAPI < Grape::API
+        version 'v5', 'v6', 'v7', using: :path
+        format :json
+
+        get :hello do
+          { message: 'Hello, world!' }
+        end
+      end
+
+      let(:app) do
+        builder = Rack::Builder.app do
+          run BasicAPI
+        end
+        Rack::MockRequest.new(builder)
+      end
+
+      let(:request_path) { '/v5/hello' }
+      let(:expected_span_name) { 'HTTP GET /hello' }
+
+      describe 'default version_format' do
+        let(:config) { { install_rack: false } }
+
+        let(:app) do
+          build_rack_app(BasicAPI)
+        end
+
+        before do
+          OpenTelemetry::Instrumentation::Rack::Instrumentation.instance.install
+        end
+
+        it 'creates a span' do
+          app.get request_path
+          _(exporter.finished_spans.first.attributes).must_equal(
+            'code.namespace' => 'BasicAPI',
+            'http.method' => 'GET',
+            'http.host' => 'unknown',
+            'http.scheme' => 'http',
+            'http.target' => '/v5/hello',
+            'http.route' => '/["v5", "v6", "v7"]/hello',
+            'http.status_code' => 200
+          )
+        end
+      end
+
+      describe 'customized version_format' do
+        let(:config) { { install_rack: false, version_format: ->(version) { version.is_a?(Array) ? "{#{version.join('|')}}" : version.to_s } } }
+
+        let(:app) do
+          build_rack_app(BasicAPI)
+        end
+
+        before do
+          OpenTelemetry::Instrumentation::Rack::Instrumentation.instance.install
+        end
+
+        it 'creates a span' do
+          app.get request_path
+          _(exporter.finished_spans.first.attributes).must_equal(
+            'code.namespace' => 'BasicAPI',
+            'http.method' => 'GET',
+            'http.host' => 'unknown',
+            'http.scheme' => 'http',
+            'http.target' => '/v5/hello',
+            'http.route' => '/{v5|v6|v7}/hello',
+            'http.status_code' => 200
+          )
+        end
+      end
+    end
   end
 end