fix: support multi key for Disk plugin ZapiPerf (#2449)

* fix: support multi key for Disk plugin ZapiPerf

cmd/collectors/zapiperf/plugins/disk/disk.go

@@ -43,7 +43,7 @@ type Disk struct {
 	*plugin.AbstractPlugin
 	shelfData      map[string]*matrix.Matrix
 	powerData      map[string]*matrix.Matrix
-	instanceKeys   map[string]string
+	instanceKeys   map[string][]string
 	instanceLabels map[string]map[string]string
 	batchSize      string
 	client         *zapi.Client
@@ -128,7 +128,7 @@ func (d *Disk) Init() error {
 	d.shelfData = make(map[string]*matrix.Matrix)
 	d.powerData = make(map[string]*matrix.Matrix)
 
-	d.instanceKeys = make(map[string]string)
+	d.instanceKeys = make(map[string][]string)
 	d.instanceLabels = make(map[string]map[string]string)
 
 	objects := d.Params.GetChildS("objects")
@@ -168,8 +168,9 @@ func (d *Disk) Init() error {
 
 				switch kind {
 				case "key":
-					d.instanceKeys[attribute] = metricName
+					d.instanceKeys[attribute] = append(d.instanceKeys[attribute], metricName)
 					d.instanceLabels[attribute][metricName] = display
+					instanceLabels.NewChildS("", display)
 					instanceKeys.NewChildS("", display)
 					d.Logger.Debug().Msgf("added instance key: (%s) (%s) [%s]", attribute, x.GetNameS(), display)
 				case "label":
@@ -817,7 +818,7 @@ func (d *Disk) handleCMode(shelves []*node.Node) ([]*matrix.Matrix, error) {
 		for attribute, data1 := range d.shelfData {
 			if statusMetric := data1.GetMetric("status"); statusMetric != nil {
 
-				if d.instanceKeys[attribute] == "" {
+				if len(d.instanceKeys[attribute]) == 0 {
 					d.Logger.Warn().Msgf("no instance keys defined for object [%s], skipping", attribute)
 					continue
 				}
@@ -832,15 +833,25 @@ func (d *Disk) handleCMode(shelves []*node.Node) ([]*matrix.Matrix, error) {
 
 				for _, obj := range objectElem.GetChildren() {
 
-					if key := obj.GetChildContentS(d.instanceKeys[attribute]); key != "" {
-						instanceKey := shelfUID + "#" + key
+					if keys := d.instanceKeys[attribute]; len(keys) != 0 {
+						var sKeys []string
+						for _, k := range keys {
+							v := obj.GetChildContentS(k)
+							sKeys = append(sKeys, v)
+						}
+						combinedKey := strings.Join(sKeys, "")
+						instanceKey := shelfUID + "#" + combinedKey
 						instance, err := data1.NewInstance(instanceKey)
 
 						if err != nil {
 							d.Logger.Error().Err(err).Str("attribute", attribute).Msg("Failed to add instance")
 							return nil, err
 						}
-						d.Logger.Debug().Msgf("add (%s) instance: %s.%s", attribute, shelfID, key)
+						d.Logger.Debug().
+							Str("attribute", attribute).
+							Str("shelfID", shelfID).
+							Str("key", combinedKey).
+							Msg("add instance")
 
 						for label, labelDisplay := range d.instanceLabels[attribute] {
 							if value := obj.GetChildContentS(label); value != "" {