Sub-ticket of PLUTO-445 Benign SEO-crawler sitemap-probe 404 noise: a crawler walks sitemap filename variants (/sitemap_index.xml, /sitemap-index.xml, + a random catch-all-200 test token /_rNd9xZ7kL3) — all correctly 404 (Pluto is auth-gated, no public index surface) but log warn/navigation/page_not_found. Two-part: (1) decide the correct SEO posture — Pluto has nothing public to index, so likely robots.txt Disallow + NO sitemap is right (confirm whether /sitemap.xml exists/should); (2) down-tier benign sitemap/SEO-crawler probe 404s to info, mirroring ICON_PROBE_RE (3c10bb0) / SCANNER_PROBE_RE (PLUTO-442) in not-found-classify. EVIDENCE-GATE the down-tier: audit quantifies frequency over the applog digest/7d BEFORE implementing (per PLUTO-442 discipline + WELLKNOWN_BENIGN_RE caution against speculative benign-matcher broadening). Anchor only to exact sitemap filename shapes; the random token is NOT safely down-tierable. Low-pri. · pluto