Distillation

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<observations> Date: Aug 4, 2026 * 🔴 (21:08) User is performing an INDEPENDENT adversarial code review of PR #21336 in getsentry/getsentry ("fix(orbital): restore notify metrics, IP fallback, and Service DNS"). Branch: `fix/orbital-volume-metrics-ip-dns` * 🔴 (21:08) PR #21336 modifies 3 files: `getsentry/conf/settings/cellsilo.py`, `getsentry/receivers/orbital.py`, `tests/getsentry/receivers/test_orbital.py` * 🔴 (21:08) PR purpose (per user): (1) restore notify_orbital to emit per-event metrics `getsentry.orbital.notify` with outcome tags; (2) fall back to `event.data.user.ip_address` when Relay's remote_addr is missing; (3) switch US default from stale Internal LB IP to Service DNS; (4) avoid spamming `no_socket` metric in non-US cells where ORBITAL_UDP_SERVER is intentionally unset * 🟡 (21:08) User asked for thorough adversarial review covering: correctness (IP fallback, geo lookup, payload construction, sendto, conditional binding, event_accepted signal handling, FQDN trailing dot behavior), code quality (abstractions, type discipline, comments, importlib.reload pattern), test quality (verification, edge cases, cleanup, fl