fix(queues): skip unsampled optional telemetry

Author: solnic

sentry-rails/spec/active_job/test_adapter_spec.rb

@@ -32,6 +32,30 @@
     end
   end
 
+  context "when the transaction is unsampled" do
+    let(:configure_sentry) { proc { |config| config.traces_sample_rate = 0.0 } }
+
+    it "enqueues and performs without encoding optional body size" do
+      performed_arguments = []
+      recording_job = job_fixture do
+        define_method(:perform) { |argument| performed_arguments << argument }
+      end
+      serializations = 0
+      serializer = TracePoint.new(:call) do |call|
+        serializations += 1 if call.self.equal?(JSON) && call.method_id == :generate
+      end
+
+      serializer.enable do
+        within_parent_transaction { recording_job.perform_later("hello") }
+        drain
+      end
+
+      expect(performed_arguments).to eq(["hello"])
+      expect(serializations).to eq(0)
+      expect(transactions).to be_empty
+    end
+  end
+
   context "when tracing is disabled" do
     it "reports job errors without messaging.message.body.size" do
       expect do