add new metrics (gauges): backup_total and restore_total

Signed-off-by: fabito <fuechi@ciandt.com>

pkg/controller/backup_controller.go

@@ -111,6 +111,8 @@ func NewBackupController(
 		backupLocationInformer.Informer().HasSynced,
 		volumeSnapshotLocationInformer.Informer().HasSynced,
 	)
+	c.resyncFunc = c.resync
+	c.resyncPeriod = time.Minute
 
 	backupInformer.Informer().AddEventHandler(
 		cache.ResourceEventHandlerFuncs{
@@ -141,6 +143,15 @@ func NewBackupController(
 	return c
 }
 
+func (c *backupController) resync() {
+	backups, err := c.lister.List(labels.Everything())
+	if err != nil {
+		c.logger.Error(err, "Error computing backup_total metric")
+	} else {
+		c.metrics.SetBackupTotal(int64(len(backups)))
+	}
+}
+
 func (c *backupController) processBackup(key string) error {
 	log := c.logger.WithField("key", key)