🔊[RUMF-257] report abnormal performance.now() (#254)

DataDog · Feb 7, 2020 · 08bdb24 · 08bdb24
1 parent 3391513
commit 08bdb24
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/packages/rum/src/rum.ts b/packages/rum/src/rum.ts
@@ -1,4 +1,5 @@
 import {
+  addMonitoringMessage,
   Batch,
   Configuration,
   Context,
@@ -144,6 +145,8 @@ export function startRum(
     )
   )
 
+  reportAbnormalPerformanceNow()
+
   const batch = startRumBatch(
     configuration,
     session,
@@ -343,3 +346,13 @@ export function handleLongTaskEntry(entry: PerformanceLongTaskTiming, addRumEven
     },
   })
 }
+
+function reportAbnormalPerformanceNow() {
+  if (performance.now() > 300e3 /* 5 min in ms*/) {
+    addMonitoringMessage(`Abnormal performance.now()
+performance.now(): ${performance.now()}
+Date.now(): ${Date.now()}
+Navigation entries: ${JSON.stringify(performance.getEntriesByType('navigation'), undefined, 2)}
+`)
+  }
+}