Summary

Following up from PLANET-6960 and an SEO audit conducted by GPSEA, it's considered a good SEO practice to have self-reference canonical links on all content.

Requirements

• Use permalink as the full url for setting the canonical link.
• Add a help text to the relevant sidebar option: If emtpy a self-reference canonical link will be used.
• Respect the value set in this field per PLANET-6960.
• Add the relevant meta tag in that post header:
  <link rel="canonical" href="https://www.example.com/post/">