docs: def _osd_pct_used(self, health):
          """Take a single health check string, return (OSD name, percentage used)"""
          # Full string looks like: osd.2 is full at 95%
          # Near full string: osd.1 is near full at 94%
          pct = re.compile(r'\d+%').findall(health)
          osd = re.compile(r'osd.\d+').findall(health)
          if len(pct) > 0 and len(osd) > 0:
              return osd[0], int(pct[0][:-1])
          else:
              return None, None