Add the posbility to use a static index for some lookup

collector/collector.go

@@ -977,7 +977,11 @@ func indexesToLabels(indexOids []int, metric *config.Metric, oidToPdu map[string
 		}
 		oid := lookup.Oid
 		for _, label := range lookup.Labels {
-			oid = fmt.Sprintf("%s.%s", oid, listToOid(labelOids[label]))
+			if _, err := strconv.ParseUint(label, 10, 64); err == nil {
+				oid = fmt.Sprintf("%s.%v", oid, label)
+			} else {
+				oid = fmt.Sprintf("%s.%s", oid, listToOid(labelOids[label]))
+			}
 		}
 		if pdu, ok := oidToPdu[oid]; ok {
 			t := lookup.Type

generator/config.go

@@ -85,4 +85,5 @@ type Lookup struct {
 	SourceIndexes     []string `yaml:"source_indexes"`
 	Lookup            string   `yaml:"lookup"`
 	DropSourceIndexes bool     `yaml:"drop_source_indexes,omitempty"`
+	CustomLabelName   string   `yaml:"custom_label_name,omitempty"`
 }

generator/tree.go

@@ -446,6 +446,13 @@
 					}
 				}
 			}
+			if foundIndexes != len(lookup.SourceIndexes) {
+				for _, index := range lookup.SourceIndexes {
+					if _, err := strconv.ParseUint(index, 10, 64); err == nil {
+						foundIndexes++
+					}
+				}
+			}
 			if foundIndexes == len(lookup.SourceIndexes) {
 				if _, ok := nameToNode[lookup.Lookup]; !ok {
 					return nil, fmt.Errorf("unknown index '%s'", lookup.Lookup)
@@ -460,6 +467,9 @@
 					Type:      typ,
 					Oid:       indexNode.Oid,
 				}
+				if len(lookup.CustomLabelName) > 0 {
+					l.Labelname = sanitizeLabelName(lookup.CustomLabelName)
+				}
 				for _, oldIndex := range lookup.SourceIndexes {
 					l.Labels = append(l.Labels, sanitizeLabelName(oldIndex))
 				}