<source>
  @type systemd
  @id systemd-input
  @label @INGRESS
  path "#{ENV['JOURNAL_SOURCE'] || '/run/log/journal'}"
  pos_file "#{ENV['JOURNAL_POS_FILE'] || '/var/log/journal.pos'}"
  filters "#{ENV['JOURNAL_FILTERS_JSON'] || '[]'}"
  tag journal
  read_from_head "#{ENV['JOURNAL_READ_FROM_HEAD'] || 'false'}"
</source>
