Add new debug logs when no probe for exception (#7786)

Add statistics about skipped frames (native or third-party) and
the full stacktrace folded in order to troubleshoot

Author: jpbempel

dd-java-agent/agent-debugger/src/main/java/com/datadog/debugger/exception/DefaultExceptionDebugger.java

@@ -89,10 +89,18 @@ public void handleException(Throwable t, AgentSpan span) {
       processSnapshotsAndSetTags(t, span, state, innerMostException, fingerprint);
       exceptionProbeManager.updateLastCapture(fingerprint);
     } else {
-      if (exceptionProbeManager.createProbesForException(innerMostException.getStackTrace())) {
+      ExceptionProbeManager.CreationResult creationResult =
+          exceptionProbeManager.createProbesForException(innerMostException.getStackTrace());
+      if (creationResult.probesCreated > 0) {
         AgentTaskScheduler.INSTANCE.execute(() -> applyExceptionConfiguration(fingerprint));
       } else {
-        LOGGER.debug("No probe created for exception: {}", innerMostException.toString());
+        if (LOGGER.isDebugEnabled()) {
+          LOGGER.debug(
+              "No probe created, nativeFrames={}, thirdPartyFrames={} for exception: {}",
+              creationResult.nativeFrames,
+              creationResult.thirdPartyFrames,
+              ExceptionHelper.foldExceptionStackTrace(innerMostException));
+        }
       }
     }
   }

dd-java-agent/agent-debugger/src/main/java/com/datadog/debugger/exception/ExceptionProbeManager.java

@@ -67,19 +67,33 @@ public ClassNameFiltering getClassNameFiltering() {
     return classNameFiltering;
   }
 
-  public boolean createProbesForException(StackTraceElement[] stackTraceElements) {
-    boolean created = false;
-    int maxFrames = maxCapturedFrames;
+  static class CreationResult {
+    final int probesCreated;
+    final int thirdPartyFrames;
+    final int nativeFrames;
+
+    public CreationResult(int probesCreated, int thirdPartyFrames, int nativeFrames) {
+      this.probesCreated = probesCreated;
+      this.thirdPartyFrames = thirdPartyFrames;
+      this.nativeFrames = nativeFrames;
+    }
+  }
+
+  public CreationResult createProbesForException(StackTraceElement[] stackTraceElements) {
+    int instrumentedFrames = 0;
+    int nativeFrames = 0;
+    int thirdPartyFrames = 0;
     for (StackTraceElement stackTraceElement : stackTraceElements) {
-      if (maxFrames <= 0) {
+      if (instrumentedFrames >= maxCapturedFrames) {
         break;
       }
       if (stackTraceElement.isNativeMethod() || stackTraceElement.getLineNumber() < 0) {
         // Skip native methods and lines without line numbers
-        // TODO log?
+        nativeFrames++;
         continue;
       }
       if (classNameFiltering.isExcluded(stackTraceElement.getClassName())) {
+        thirdPartyFrames++;
         continue;
       }
       Where where =
@@ -89,11 +103,10 @@ public boolean createProbesForException(StackTraceElement[] stackTraceElements)
               null,
               String.valueOf(stackTraceElement.getLineNumber()));
       ExceptionProbe probe = createMethodProbe(this, where);
-      created = true;
       probes.putIfAbsent(probe.getId(), probe);
-      maxFrames--;
+      instrumentedFrames++;
     }
-    return created;
+    return new CreationResult(instrumentedFrames, thirdPartyFrames, nativeFrames);
   }
 
   void addFingerprint(String fingerprint) {