one half of a possible solution to avoid tracing if APM intake requests

The other half is this in elastic-apm-http-client:
    --- apm-nodejs-http-client/index.js	2021-06-09 15:57:41.000000000 -0700
    +++ node_modules/elastic-apm-http-client/index.js	2021-08-09 15:15:37.000000000 -0700
    @@ -205,9 +205,11 @@
       switch (this._conf.serverUrl.protocol) {
         case 'http:':
           this._transport = http
    +      this._uninstrumentedRequest = http.request[this._conf.originalSym]
           break
         case 'https:':
           this._transport = https
    +      this._uninstrumentedRequest = https.request[this._conf.originalSym]
           break
         default:
           throw new Error('Unknown protocol ' + this._conf.serverUrl.protocol)
    @@ -794,7 +796,8 @@
         }

         // Start the request and set its timeout.
    -    const intakeReq = client._transport.request(client._conf.requestIntake)
    +    console.warn('XXX making intake request', client._conf.requestIntake.path)
    +    const intakeReq = client._uninstrumentedRequest(client._conf.requestIntake)
         if (Number.isFinite(client._conf.serverTimeout)) {
           intakeReq.setTimeout(client._conf.serverTimeout)
         }

Author: trentm

lib/config.js

@@ -10,6 +10,7 @@ var truncate = require('unicode-byte-truncate')
 var logging = require('./logging')
 var version = require('../package').version
 var packageName = require('../package').name
+var symbols = require('./symbols')
 
 const { WildcardMatcher } = require('./wildcard-matcher')
 const { CloudMetadata } = require('./cloud-metadata')
@@ -303,6 +304,7 @@ class Config {
           serverCaCert: loadServerCaCertFile(conf),
           rejectUnauthorized: conf.verifyServerCert,
           serverTimeout: conf.serverTimeout * 1000,
+          originalSym: symbols.original,
 
           // APM Agent Configuration via Kibana:
           centralConfig: conf.centralConfig,

lib/instrumentation/shimmer.js

@@ -66,6 +66,7 @@ function wrap (nodule, name, wrapper) {
   var wrapped = wrapper(original, name)
 
   wrapped[isWrappedSym] = true
+  wrapped[symbols.original] = original // XXX circular ref leak!?
   wrapped[symbols.unwrap] = function elasticAPMUnwrap () {
     if (nodule[name] === wrapped) {
       nodule[name] = original