Turn async ID gathering off by default.

Author: szegedi

integration-tests/profiler/profiler.spec.js

@@ -317,12 +317,14 @@ describe('profiler', () => {
       // see comment on busyCycleTimeNs recomputation below. Ideally a single retry should be enough
       // with recomputed busyCycleTimeNs, but let's give ourselves more leeway.
       this.retries(9)
+      const asyncIdWorks = require('semifies')(process.versions.node, '>=22.10.0')
       const procStart = BigInt(Date.now() * 1000000)
       const proc = fork(path.join(cwd, 'profiler/codehotspots.js'), {
         cwd,
         env: {
           DD_PROFILING_EXPORTERS: 'file',
           DD_PROFILING_ENABLED: 1,
+          DD_PROFILING_ASYNC_ID_ENABLED: asyncIdWorks ? 1 : 0,
           BUSY_CYCLE_TIME: (busyCycleTimeNs | 0).toString()
         }
       })
@@ -368,7 +370,6 @@ describe('profiler', () => {
       const threadNameValue = strings.dedup('Main Event Loop')
       const nonJSThreadNameValue = strings.dedup('Non-JS threads')
 
-      const asyncIdWorks = require('semifies')(process.versions.node, '>=22.10.0')
       for (const sample of profile.sample) {
         let ts, spanId, rootSpanId, endpoint, threadName, threadId, osThreadId, asyncId
         for (const label of sample.label) {

packages/dd-trace/src/profiling/config.js

@@ -181,9 +181,19 @@ class Config {
     this.timelineSamplingEnabled = isTrue(coalesce(options.timelineSamplingEnabled,
       DD_INTERNAL_PROFILING_TIMELINE_SAMPLING_ENABLED, true))
 
-    // Async ID gathering only works reliably on Node >= 22.10.0
     this.asyncIdEnabled = isTrue(coalesce(options.asyncIdEnabled,
-      DD_PROFILING_ASYNC_ID_ENABLED, this.timelineEnabled && satisfies(process.versions.node, '>=22.10.0')))
+      DD_PROFILING_ASYNC_ID_ENABLED, false))
+    if (this.asyncIdEnabled) {
+      if (!satisfies(process.versions.node, '>=22.10.0')) {
+        logger.warn('Async ID gathering is enabled, but it only works reliably on Node >= 22.10.0.')
+      }
+      if (!this.timelineEnabled) {
+        logger.warn(
+          'Async ID gathering is enabled, but timeline is disabled. ' +
+          'Async IDs are not useful without the timeline view.'
+        )
+      }
+    }
 
     this.codeHotspotsEnabled = isTrue(coalesce(options.codeHotspotsEnabled,
       DD_PROFILING_CODEHOTSPOTS_ENABLED,