code> label when using revisions. For example, if we had a revision named canary, we would label our namespaces that we want to use this revision with istio.io/rev=canary. See the <a href=/v1.6/docs/setup/upgrade>upgrade guide</a> for more information.</p><nav id=see-also><h2>See also</h2><div class=see-also><div class=entry><p class=link><a data-skipendnotes=true href=/v1.6/blog/2020/istiod/>Introducing istiod: simplifying the control plane</a></p><p class=desc>Istiod consolidates the Istio control plane c