informer/disk: set repoSize weight to negative

smaller repositories should have more priority

informer/disk/disk.go

@@ -105,7 +105,8 @@ func (disk *Informer) GetMetrics(ctx context.Context) []api.Metric {
 	}
 
 	var repoStat api.IPFSRepoStat
-	var metric uint64
+	var weight uint64
+	var value string
 
 	valid := true
 
@@ -126,24 +127,27 @@ func (disk *Informer) GetMetrics(ctx context.Context) []api.Metric {
 			size := repoStat.RepoSize
 			total := repoStat.StorageMax
 			if size < total {
-				metric = total - size
+				weight = total - size
 			} else {
 				// Make sure we don't underflow and stop
 				// sending this metric when space is exhausted.
-				metric = 0
+				weight = 0
 				valid = false
 				logger.Warn("reported freespace is 0")
 			}
+			value = fmt.Sprintf("%d", weight)
 		case MetricRepoSize:
-			metric = repoStat.RepoSize
+			// smaller repositories have more priority
+			weight = -repoStat.RepoSize
+			value = fmt.Sprintf("%d", repoStat.RepoSize)
 		}
 	}
 
 	m := api.Metric{
 		Name:          disk.Name(),
-		Value:         fmt.Sprintf("%d", metric),
+		Value:         value,
 		Valid:         valid,
-		Weight:        int64(metric),
+		Weight:        int64(weight),
 		Partitionable: false,
 	}