old_contents: import asyncio
  
  from . import Agent
  from asyncio.subprocess import PIPE
  
  
  class SubprocessAgent(Agent):
  
      @property
      def script(self):
          return self._data["script"]
  
      def is_valid(self):
          return "script" in self._data
  
      async def process(self, event_fn):
          logger = self.get_logger()
          proc = await asyncio.create_subprocess_shell(self.script)
          exitcode = await proc.wait()
          state = "ok" if exitcode == 0 else "failure"
          event_fn(service=self.prefix,
                   state=state,
                   metric_f=1.0,
                   description="Exit code: {0}".format(exitcode)
                   )
  
new_contents: import asyncio
  
  from . import Agent
  from asyncio.subprocess import PIPE
  
  
  class SubprocessAgent(Agent):
  
      @property
      def script(self):
          return self._data["script"]
  
      def is_valid(self):
          return "script" in self._data
  
      async def process(self, event_fn):
          logger = self.get_logger()
          proc = await asyncio.create_subprocess_shell(self.script)
          exitcode = await proc.wait()
          state = "ok" if exitcode == 0 else "failure"
          event_fn(service=self.prefix + "shell",
                   state=state,
                   metric_f=1.0,
                   description="Exit code: {0}".format(exitcode)
                   )
  
subject: Add postfix for subprocess metric