feat: reset metrics on every iteration

main.go

@@ -57,6 +57,8 @@ func main() {
 
 func RecordMetrics(m Metrics) {
 	for {
+		m.Reset()
+
 		entries, err := os.ReadDir(*backupDir)
 		if err != nil {
 			log.Fatalln(err)

metrics.go

@@ -41,3 +41,18 @@ func NewMetrics(reg prometheus.Registerer) *Metrics {
 
 	return metrics
 }
+
+// Reset all metrics
+//
+// This should be called on every loop iteration.
+func (m *Metrics) Reset() {
+	m.ArchiveCount.Reset()
+	m.LastArchiveTime.Reset()
+	m.LastModified.Reset()
+	m.TotalChunks.Reset()
+	m.TotalCsize.Reset()
+	m.TotalSize.Reset()
+	m.TotalUniqueChunks.Reset()
+	m.UniqueCsize.Reset()
+	m.UniqueSize.Reset()
+}