Doppler change history: Background job delays impacting sync, webhook and email delivery

Doppler reported a major incident delaying integration sync, webhooks and email delivery, starting at 2025-11-20 15:55 UTC and resolved at 2025-11-20 19:46 UTC; the reported duration was 3 h 50 min. A fix was implemented by 18:54 UTC, but no cause or fix details were stated.