Clean up monitor on delete bucket (#10698)

cmd/bucket-metadata-sys.go

@@ -49,6 +49,7 @@ func (sys *BucketMetadataSys) Remove(bucket string) {
 	}
 	sys.Lock()
 	delete(sys.metadataMap, bucket)
+	globalBucketMonitor.DeleteBucket(bucket)
 	sys.Unlock()
 }
 

pkg/bucket/bandwidth/monitor.go

@@ -170,3 +170,10 @@ func (m *Monitor) track(bucket string, object string, timeNow time.Time) *bucket
 	b := m.getBucketMeasurement(bucket, timeNow)
 	return b
 }
+
+func (m *Monitor) DeleteBucket(bucket string) {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+	delete(m.activeBuckets, bucket)
+	delete(m.bucketThrottle, bucket)
+}