スパンタグを追加し、アプリケーションのパフォーマンスをフィルタリングし、グループ化する

import io.opentracing.Span;
import io.opentracing.util.GlobalTracer;

@WebServlet
class ShoppingCartServlet extends AbstractHttpServlet {
  @Override
  void doGet(HttpServletRequest req, HttpServletResponse resp) {
    // アクティブスパンを取得
    final Span span = GlobalTracer.get().activeSpan();
    if (span != null) {
      // customer_id -> 254889
      span.setTag("customer.id", customer_id);
    }

    // [...]
  }
}

from ddtrace import tracer

@app.route('/shopping_cart/<int:customer_id>')
@login_required
def shopping_cart(customer_id):
    # アクティブスパンを取得
    current_span = tracer.current_span()
    if current_span:
        # customer_id -> 254889
        current_span.set_tag('customer.id', customer_id)

    # [...]

require 'ddtrace'

# get '/shopping_cart/:customer_id', to: 'shopping_cart#index'
class ShoppingCartController < ApplicationController
  # GET /shopping_cart
  def index
    #アクティブスパンを取得し、customer_id -> 254889 を設定します
    Datadog::Tracing.active_span&.set_tag('customer.id', params.permit([:customer_id]))

    # [...]
  end

  # POST /shopping_cart
  def create
    # [...]
  end
end

package main

import (
    muxtrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/gorilla/mux"

    "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
)

func handler(w http.ResponseWriter, r *http.Request) {
    vars := mux.Vars(r)
    // Go Context からアクティブスパンを取得
    if span, ok := tracer.SpanFromContext(r.Context()); ok {
      // customer_id -> 254889
      span.SetTag("customer.id", vars["customerID"])
    }

    // [...]
}

func main() {
    tracer.Start(tracer.WithServiceName("web-store"))
    defer tracer.Stop()
    // 自動インスツルメンテーションを使用
    mux := muxtrace.NewRouter()
    mux.HandleFunc("/shopping_cart/{customerID}", handler)
    http.ListenAndServe(":8080", mux)
}

app.get('/shopping_cart/:customer_id', (req, res) => {
  // アクティブスパンを取得
  const span = tracer.scope().active()
  if (span !== null) {
    // customer_id -> 254889
    span.setTag('customer.id', req.params.customer_id)
  }

  // [...]
})

public class ShoppingCartController : Controller
{
    private IShoppingCartRepository _shoppingCartRepository;

    [HttpGet]
    public IActionResult Index(int customerId)
    {
        // グローバルトレーサーからアクティブスパンを取得 (null を返す)
        var scope = Tracer.Instance.ActiveScope;

        if (scope != null)
        {
            // タグをスパンに追加して Datadog ウェブ UI で使用
            scope.Span.SetTag("customer.id", customerId.ToString());
        }

        var cart = _shoppingCartRepository.Get(customerId);

        return View(cart);
    }
}

<?php
  namespace App\Http\Controllers;

  class ShoppingCartController extends Controller
  {
      public shoppingCartAction (Request $request) {
          // 現在のアクティブスパンを取得
          $span = \DDTrace\active_span();
          if (null !== $span) {
              // customer_id -> 254889
              $span->meta['customer_id'] = $request->get('customer_id');
          }

          // [...]
      }
  }
?>