istiodchart[label="istiod",class="helm"]
  cpt -> istiodchart
  istiodchart -> istiod18
  istiodchart -> istiod19
  cnichart[label="cni",class="helm"]
  cni -> cnichart -> cnids
  istiogh[label="istio github"]
  extras -> istiogh -> extrads
  tagchart[label="tag*"]
  edge[weight=1]
  tags->tagchart->tagdef
  tagchart->tagrap
  tagchart->tagsta