text: import os,re,time
  from prometheus_client import start_http_server, Gauge
  g=Gauge('pvc_usage','fetching usge matched by k8s csi',['volumename'])
  start_http_server(8848)
  while 1:
    get_pvc=os.popen("df -h|grep 'kubernetes.io~csi'")
    pvcs=get_pvc.readlines()
    for i in pvcs:
      il=i.split(' ')
      volume=il[-1].split('/')[-1]
      for v in il[-1].split('/'):
        if re.match("^pvc",v):
          volume=v
      for u in il:
        if re.match("^[0-9]*\%",u):
          usage=float(u.strip('%'))/100.0
          #pvc_usage[volume]=usage
          print(volume,usage)
          g.labels(volume).set(usage)
  
    time.sleep(15)
  