Add ceph_health metrics to ceph input (#5482)

plugins/inputs/ceph/ceph.go

@@ -319,6 +319,10 @@ func (c *Ceph) exec(command string) (string, error) {
 
 // CephStatus is used to unmarshal "ceph -s" output
 type CephStatus struct {
+	Health struct {
+		Status        string `json:"status"`
+		OverallStatus string `json:"overall_status"`
+	} `json:"health"`
 	OSDMap struct {
 		OSDMap struct {
 			Epoch          float64 `json:"epoch"`
@@ -357,6 +361,7 @@ func decodeStatus(acc telegraf.Accumulator, input string) error {
 	}
 
 	decoders := []func(telegraf.Accumulator, *CephStatus) error{
+		decodeStatusHealth,
 		decodeStatusOsdmap,
 		decodeStatusPgmap,
 		decodeStatusPgmapState,
@@ -371,6 +376,16 @@ func decodeStatus(acc telegraf.Accumulator, input string) error {
 	return nil
 }
 
+// decodeStatusHealth decodes the health portion of the output of 'ceph status'
+func decodeStatusHealth(acc telegraf.Accumulator, data *CephStatus) error {
+	fields := map[string]interface{}{
+		"status":         data.Health.Status,
+		"overall_status": data.Health.OverallStatus,
+	}
+	acc.AddFields("ceph_health", fields, map[string]string{})
+	return nil
+}
+
 // decodeStatusOsdmap decodes the OSD map portion of the output of 'ceph -s'
 func decodeStatusOsdmap(acc telegraf.Accumulator, data *CephStatus) error {
 	fields := map[string]interface{}{