Metadata and net:container vs deployment unit

1

In the following part of the catalogue, I use confd in the -config image.
I copied that more or less from the elasticsearch example and am trying to sort things out…

To start I have a couple of questions:

  1. What is the role of net: “container:telegraf-config” ? Can I drop it?
  2. Can be confirmed, that the deployment unit concept is responsible for that custom metadata, while defined only on telegraf service is shared with telegraf-config service?
telegraf-config:
  image: registry.devco.co/telegraf-config:1.0.0

telegraf:
  net: "container:telegraf-config"
  image: registry.devco.co/telegraf:1.0.0-beta3-alpine
  volumes_from:
    - telegraf-config
  links:
    - influxdb
  ports:
    - "8092:8092/udp"
    - "8094:8094"
    - "8125:8125/udp"
  labels:
    io.rancher.scheduler.global: 'true'
    io.rancher.sidekicks: telegraf-config