Ably change history: Elevated API Errors

Ably reported a major DDoS incident causing token-request errors across all Ably Realtime regions (503 responses) and intermittent ably.com unavailability. Recorded start: 2026-10-01 15:36 UTC; duration: 26 min, with token errors lasting approximately six minutes. Ably restored token-request service by increasing capacity and added targeted traffic-blocking and rate-limiting rules.