code: def post_slack_message(message=None, channel=None, username=None, icon_emoji=None):
      
      LOG.debug('Slack Channel: %s\nSlack Message: %s', channel, message)
      slack = slacker.Slacker(SLACK_TOKEN)
      try:
          slack.chat.post_message(channel=channel, text=message, username=username, icon_emoji=icon_emoji)
          LOG.info('Message posted to %s', channel)
      except slacker.Error:
          LOG.info("error posted message to %s", channel)
docs: Format the message and post to the appropriate slack channel.
  
      Args:
          message (str): Message to post to slack
          channel (str): Desired channel. Must start with #