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/metrics is behind a password, and REPO_POLICIES.md requires rate limiting on password logins. Each client address may now send it 30 requests a minute, counted by httprate before Basic Auth, so failed logins use up the allowance and a request over it gets 429 without the password being checked. The address is the one the existing trusted-proxy logic in internal/middleware works out, with IPv6 addresses grouped by /64; an IPv4 address a proxy reports in IPv6-mapped form counts as the plain IPv4 address. A Prometheus server scraping every 15 seconds sends 4 requests a minute. Model: opus-5-5