new_contents: import psutil
  
  from checks.base import Check
  from checks.results import Result
  
  
  class MemoryCheck(Check):
      WARNING_THRESHOLD = 10
      ERROR_THRESHOLD = 10
      HOST = None
  
      @classmethod
      def run(cls):
          try:
              memory = psutil.virtual_memory()
              available = '{:n}'.format(int(memory.available / 1024 / 1024))
              if memory.available < (cls.ERROR_THRESHOLD * 1024 * 1024):
                  result = Result(
                      message='Memory available ({}) is below error threshold ({})'.format(
                          available, cls.ERROR_THRESHOLD),
                      severity=Result.ERROR
                  )
              elif memory.available < (cls.ERROR_THRESHOLD * 1024 * 1024):
                  result = Result(
                      message='Memory available ({}) is below warning threshold ({})'.format(
                          available, cls.WARNING_THRESHOLD),
                      severity=Result.WARNING
                  )
              else:
                  result = Result()
          except ValueError:
              result = Result(
                  message='An error was raised, try again later.',
                  severity=Result.ERROR
              )
          return {'MEMORY': result}
  
subject: Add memory check