[Datadog] Fix Graphql tracing

src/lib/datadog.ts

@@ -1,4 +1,6 @@
 import ddTracer from "dd-trace"
+import { Request } from "express"
+import url from "url"
 
 if (process.env.DD_APM_ENABLED) {
   ddTracer.init({
@@ -10,6 +12,19 @@ if (process.env.DD_APM_ENABLED) {
     // We want the root spans of MP to be labelled as just `service`
     service: "force",
     headers: ["User-Agent"],
+    // See: https://github.com/DataDog/dd-trace-js/issues/477#issuecomment-470299277
+    // @ts-ignore
+    hooks: {
+      request: (span, req: Request) => {
+        if (req.route.path.includes("*")) {
+          span.setTag(
+            "http.route",
+            // Remove query string, fragment and trailing slash
+            url.parse(req.originalUrl).pathname.replace(/\/$/, "")
+          )
+        }
+      },
+    },
   })
   ddTracer.use("http", {
     service: `force.http-client`,