More logging.

receiver/dcgmreceiver/client.go

@@ -384,9 +384,11 @@ func (client *dcgmClient) collectDeviceMetrics() (map[uint][]dcgmMetric, error)
 	var err scrapererror.ScrapeErrors
 	gpuMetrics := make(map[uint][]dcgmMetric)
 	for _, gpuIndex := range client.deviceIndices {
+		client.logger.Debugf("Polling DCGM daemon for GPU %d", gpuIndex)
 		retry := true
 		for i := 0; retry && i < client.maxRetries; i++ {
 			fieldValues, pollErr := dcgmGetLatestValuesForFields(gpuIndex, client.enabledFieldIDs)
+			client.logger.Debugf("Got %d field values", len(fieldValues))
 			if pollErr == nil {
 				gpuMetrics[gpuIndex], retry = client.appendMetrics(gpuMetrics[gpuIndex], gpuIndex, fieldValues)
 				if retry {

receiver/dcgmreceiver/scraper.go

@@ -180,14 +180,21 @@ func (s *dcgmScraper) scrape(_ context.Context) (pmetric.Metrics, error) {
 		return s.mb.Emit(), err
 	}
 
+	s.settings.Logger.Sugar().Info(fmt.Sprintf("Client created: %v; collecting metrics", s.client))
 	deviceMetrics, err := s.client.collectDeviceMetrics()
+	if err != nil {
+		s.settings.Logger.Sugar().Warn(fmt.Sprintf("Metrics not collected; err=%v", err))
+		return s.mb.Emit(), err
+	}
+	s.settings.Logger.Sugar().Info(fmt.Sprintf("Metrics collected: %d", len(deviceMetrics)))
 
 	now := pcommon.NewTimestampFromTime(time.Now())
 	for gpuIndex, gpuMetrics := range deviceMetrics {
 		metricsByName := make(map[string][]dcgmMetric)
 		for _, metric := range gpuMetrics {
 			metricsByName[metric.name] = append(metricsByName[metric.name], metric)
 		}
+		s.settings.Logger.Sugar().Warn(fmt.Sprintf("Got %d unique metrics: %v", len(metricsByName), metricsByName))
 		metrics := make(map[string]dcgmMetric)
 		for name, points := range metricsByName {
 			slices.SortStableFunc(points, func(a, b dcgmMetric) int {