[EBPF] attacher: Add Log() call to registry (DataDog#31390)

pkg/ebpf/uprobes/attacher.go

@@ -295,6 +295,9 @@ type FileRegistry interface {
 
 	// GetRegisteredProcesses returns a map of all the processes that are currently registered in the registry
 	GetRegisteredProcesses() map[uint32]struct{}
+
+	// Log is a function that gets called periodically to log the state of the registry
+	Log()
 }
 
 // AttachCallback is a callback that is called whenever a probe is attached successfully
@@ -489,6 +492,9 @@ func (ua *UprobeAttacher) Start() error {
 			case <-processSync.C:
 				// We always track process deletions in the scan, to avoid memory leaks.
 				_ = ua.Sync(ua.config.EnablePeriodicScanNewProcesses, true)
+
+				// Periodically log the state of the registry
+				ua.fileRegistry.Log()
 			}
 		}
 	}()

pkg/ebpf/uprobes/attacher_test.go

@@ -326,6 +326,7 @@ func TestMonitor(t *testing.T) {
 
 	// Tell mockRegistry to return on any calls, we will check the values later
 	mockRegistry.On("Clear").Return()
+	mockRegistry.On("Log").Return()
 	mockRegistry.On("Unregister", mock.Anything).Return(nil)
 	mockRegistry.On("Register", mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return(nil)
 	lib := getLibSSLPath(t)
@@ -872,6 +873,7 @@ func (s *SharedLibrarySuite) TestSingleFile() {
 
 	// Tell mockRegistry to return on any calls, we will check the values later
 	mockRegistry.On("Clear").Return()
+	mockRegistry.On("Log").Return()
 	mockRegistry.On("Unregister", mock.Anything).Return(nil)
 	mockRegistry.On("Register", mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return(nil)
 
@@ -950,6 +952,7 @@ func (s *SharedLibrarySuite) TestDetectionWithPIDAndRootNamespace() {
 
 	// Tell mockRegistry to return on any calls, we will check the values later
 	mockRegistry.On("Clear").Return()
+	mockRegistry.On("Log").Return()
 	mockRegistry.On("Unregister", mock.Anything).Return(nil)
 	mockRegistry.On("Register", mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return(nil)
 

pkg/ebpf/uprobes/testutil.go

@@ -78,6 +78,11 @@ func (m *MockFileRegistry) GetRegisteredProcesses() map[uint32]struct{} {
 	return args.Get(0).(map[uint32]struct{})
 }
 
+// Log is a mock implementation of the FileRegistry.Log method.
+func (m *MockFileRegistry) Log() {
+	m.Called()
+}
+
 // MockBinaryInspector is a mock implementation of the BinaryInspector interface.
 type MockBinaryInspector struct {
 	mock.Mock