metrics: add items gauges

Signed-off-by: Tobias Giese <tobias.giese@daimler.com>

changelogs/unreleased/4296-tobiasgiese

@@ -0,0 +1 @@
+Add metrics backup_items_total and backup_items_errors

pkg/controller/backup_controller.go

@@ -627,15 +627,15 @@ func (c *backupController) runBackup(backup *pkgbackup.Request) error {
 		}
 	}
 
+	backup.Status.Warnings = logCounter.GetCount(logrus.WarnLevel)
+	backup.Status.Errors = logCounter.GetCount(logrus.ErrorLevel)
+
 	recordBackupMetrics(backupLog, backup.Backup, backupFile, c.metrics)
 
 	if err := gzippedLogFile.Close(); err != nil {
 		c.logger.WithField(Backup, kubeutil.NamespaceAndName(backup)).WithError(err).Error("error closing gzippedLogFile")
 	}
 
-	backup.Status.Warnings = logCounter.GetCount(logrus.WarnLevel)
-	backup.Status.Errors = logCounter.GetCount(logrus.ErrorLevel)
-
 	// Assign finalize phase as close to end as possible so that any errors
 	// logged to backupLog are captured. This is done before uploading the
 	// artifacts to object storage so that the JSON representation of the
@@ -685,6 +685,10 @@ func recordBackupMetrics(log logrus.FieldLogger, backup *velerov1api.Backup, bac
 	serverMetrics.RegisterVolumeSnapshotAttempts(backupScheduleName, backup.Status.VolumeSnapshotsAttempted)
 	serverMetrics.RegisterVolumeSnapshotSuccesses(backupScheduleName, backup.Status.VolumeSnapshotsCompleted)
 	serverMetrics.RegisterVolumeSnapshotFailures(backupScheduleName, backup.Status.VolumeSnapshotsAttempted-backup.Status.VolumeSnapshotsCompleted)
+	if backup.Status.Progress != nil {
+		serverMetrics.RegisterBackupItemsTotalGauge(backupScheduleName, backup.Status.Progress.TotalItems)
+	}
+	serverMetrics.RegisterBackupItemsErrorsGauge(backupScheduleName, backup.Status.Errors)
 }
 
 func persistBackup(backup *pkgbackup.Request,

pkg/metrics/metrics.go

@@ -43,6 +43,8 @@ const (
 	backupDeletionSuccessTotal    = "backup_deletion_success_total"
 	backupDeletionFailureTotal    = "backup_deletion_failure_total"
 	backupLastSuccessfulTimestamp = "backup_last_successful_timestamp"
+	backupItemsTotalGauge         = "backup_items_total"
+	backupItemsErrorsGauge        = "backup_items_errors"
 	restoreTotal                  = "restore_total"
 	restoreAttemptTotal           = "restore_attempt_total"
 	restoreValidationFailedTotal  = "restore_validation_failed_total"
@@ -179,6 +181,22 @@ func NewServerMetrics() *ServerMetrics {
 				},
 				[]string{scheduleLabel},
 			),
+			backupItemsTotalGauge: prometheus.NewGaugeVec(
+				prometheus.GaugeOpts{
+					Namespace: metricNamespace,
+					Name:      backupItemsTotalGauge,
+					Help:      "Total number of items backed up",
+				},
+				[]string{scheduleLabel},
+			),
+			backupItemsErrorsGauge: prometheus.NewGaugeVec(
+				prometheus.GaugeOpts{
+					Namespace: metricNamespace,
+					Name:      backupItemsErrorsGauge,
+					Help:      "Total number of errors encountered during backup",
+				},
+				[]string{scheduleLabel},
+			),
 			restoreTotal: prometheus.NewGauge(
 				prometheus.GaugeOpts{
 					Namespace: metricNamespace,
@@ -337,6 +355,12 @@ func (m *ServerMetrics) InitSchedule(scheduleName string) {
 	if c, ok := m.metrics[backupDeletionFailureTotal].(*prometheus.CounterVec); ok {
 		c.WithLabelValues(scheduleName).Add(0)
 	}
+	if c, ok := m.metrics[backupItemsTotalGauge].(*prometheus.GaugeVec); ok {
+		c.WithLabelValues(scheduleName).Add(0)
+	}
+	if c, ok := m.metrics[backupItemsErrorsGauge].(*prometheus.GaugeVec); ok {
+		c.WithLabelValues(scheduleName).Add(0)
+	}
 	if c, ok := m.metrics[restoreAttemptTotal].(*prometheus.CounterVec); ok {
 		c.WithLabelValues(scheduleName).Add(0)
 	}
@@ -486,6 +510,21 @@ func (m *ServerMetrics) RegisterBackupDeletionSuccess(backupSchedule string) {
 	}
 }
 
+// RegisterBackupItemsTotalGauge records the number of items to be backed up.
+func (m *ServerMetrics) RegisterBackupItemsTotalGauge(backupSchedule string, items int) {
+	if c, ok := m.metrics[backupItemsTotalGauge].(*prometheus.GaugeVec); ok {
+		c.WithLabelValues(backupSchedule).Set(float64(items))
+	}
+}
+
+// RegisterBackupItemsErrorsGauge records the number of all error messages that were generated during
+// execution of the backup.
+func (m *ServerMetrics) RegisterBackupItemsErrorsGauge(backupSchedule string, items int) {
+	if c, ok := m.metrics[backupItemsErrorsGauge].(*prometheus.GaugeVec); ok {
+		c.WithLabelValues(backupSchedule).Set(float64(items))
+	}
+}
+
 // toSeconds translates a time.Duration value into a float64
 // representing the number of seconds in that duration.
 func toSeconds(d time.Duration) float64 {