Incident Library

Organisation

Upstash

Upstash · upstash

2 cases · 2025 to 2026

Root cause Software defect2
Component In-memory cache1Database replication1Job scheduler service1
Contributing factor Automation amplification1Partial rollout1
Symptom Duplicate delivery or execution1High latency1Sustained high node CPU1Split brain1

Cases

  1. IL-0377 Upstash QStash schedules in the US region were lost, revived or run twice after the old and new schedulers divergedUpstash · 2026

    Root cause Software defect

  2. IL-0376 A maintenance update set off needless full syncs between Upstash Redis replicas in eu-west-1, slowing the databasesUpstash · 2025

    Root cause Software defect