Add a few TODO's (#5477)

Author: watson

packages/datadog-instrumentations/src/router.js

@@ -5,6 +5,7 @@ const pathToRegExp = require('path-to-regexp')
 const shimmer = require('../../datadog-shimmer')
 const { addHook, channel } = require('./helpers/instrument')
 
+// TODO: Move this function to a shared file between Express and Router
 function createWrapRouterMethod (name) {
   const enterChannel = channel(`apm:${name}:middleware:enter`)
   const exitChannel = channel(`apm:${name}:middleware:exit`)

packages/dd-trace/src/plugins/plugin.js

@@ -18,10 +18,12 @@ class Subscription {
   }
 
   enable () {
+    // TODO: Once Node.js v18.6.0 is no longer supported, we should use `dc.subscribe(event, handler)` instead
     this._channel.subscribe(this._handler)
   }
 
   disable () {
+    // TODO: Once Node.js v18.6.0 is no longer supported, we should use `dc.unsubscribe(event, handler)` instead
     this._channel.unsubscribe(this._handler)
   }
 }