nx_sites_telemetry.nx

nx_sites_telemetry.nx -- the SENSE layer of the self-improving sites system. Per-connection, append-only telemetry + access-path classification (LAN vs internet). Design cardinals honored: - ADDITIVE-ONLY (Cardinal 13): records are appended to a persistent log and never rewritten/deleted. History is the training data for the DECIDE + IMPROVE layers. - GRACEFUL DEGRADATION (Cardinal 14): telemetry is fire-and-forget; a logging failure must never crash a served request. All emit paths no-op on a bad fd. - SAME EXPERIENCE LAN+INTERNET: access class is OBSERVATIONAL here. The serving path dispatches by Host/path only -- never by source IP -- so both access paths receive byte-identical content. This module only LABELS the connection; it does not branch content. - CONSTANT MEMORY: the caller hoists the line buffer + holds one append fd open for the daemon's lifetime (no per-connection mmap / open-close in the hot path). Record line (text, greppable; the IMPROVE layer parses these): ts=<us> acc=<L|N> vh=<id> hs=<us> by=<n> rc=<n>\n acc: L=LAN (RFC1918/loopback), N=internet. vh: vhost id (0=family/default, 1=andelinwest, 2=wiki). hs: TLS handshake duration in microseconds. by: response bytes served. rc: 0 = handshake OK; negative = the failing -(NX_TLS13_SRUN_*). license_tier: ORIGINAL