H011
A page sets no meta, or leaves out its title or description: they come from what it renders (its h1, its first paragraph) or the site default.
Fix: Add meta when you build the page, in words written for it; the diagnostic carries a starting point.
Status in kerf@0.1.0: reported by kerf check and by kerf routes --meta, per route, on what the routes produce.
More: kerf docs meta.