R4 — Thin cluster rule

What it detects

URL templates (programmatic page families like /products/[slug] or /city/[name]) where you have lots of pages but they get almost no traffic per page — the classic "thin programmatic content" mistake.

Heuristic

• Cluster has ≥ min_cluster_size pages (default 10).
• Either avg impressions per page over 28d < max_avg_impressions_per_page (default 5), OR avg word count < min_avg_word_count (default 300).

Suggested action

Either improve the template (add unique copy per page, citations, embedded data) or consolidate by removing the thin pages and 301'ing to a parent.