Add kube_inventory input plugin (#5110)

plugins/inputs/kube_inventory/persistentvolumeclaim.go

@@ -0,0 +1,49 @@
+package kube_inventory
+
+import (
+	"context"
+	"strings"
+
+	"github.com/ericchiang/k8s/apis/core/v1"
+
+	"github.com/influxdata/telegraf"
+)
+
+func collectPersistentVolumeClaims(ctx context.Context, acc telegraf.Accumulator, ki *KubernetesInventory) {
+	list, err := ki.client.getPersistentVolumeClaims(ctx)
+	if err != nil {
+		acc.AddError(err)
+		return
+	}
+	for _, pvc := range list.Items {
+		if err = ki.gatherPersistentVolumeClaim(*pvc, acc); err != nil {
+			acc.AddError(err)
+			return
+		}
+	}
+}
+
+func (ki *KubernetesInventory) gatherPersistentVolumeClaim(pvc v1.PersistentVolumeClaim, acc telegraf.Accumulator) error {
+	phaseType := 3
+	switch strings.ToLower(pvc.Status.GetPhase()) {
+	case "bound":
+		phaseType = 0
+	case "lost":
+		phaseType = 1
+	case "pending":
+		phaseType = 2
+	}
+	fields := map[string]interface{}{
+		"phase_type": phaseType,
+	}
+	tags := map[string]string{
+		"pvc_name":     pvc.Metadata.GetName(),
+		"namespace":    pvc.Metadata.GetNamespace(),
+		"phase":        pvc.Status.GetPhase(),
+		"storageclass": pvc.Spec.GetStorageClassName(),
+	}
+
+	acc.AddFields(persistentVolumeClaimMeasurement, fields, tags)
+
+	return nil
+}