define contact {
      contact_name                             slack
      alias                                    Slack
      service_notification_period              24x7
      host_notification_period                 24x7
      service_notification_options             w,u,c,r
      host_notification_options                d,r
      service_notification_commands            notify-service-by-slack
      host_notification_commands               notify-host-by-slack
}

define command {
      command_name     notify-service-by-slack
      command_line     /usr/local/bin/slack_nagios.sh > /tmp/slack.log 2>&1
}

define command {
      command_name     notify-host-by-slack
      command_line     /usr/local/bin/slack_nagios.sh > /tmp/slack.log 2>&1
}