Pusher outage, 21 October 2025
Elevated API Errors in AP4 Cluster
- Started
- Resolved
- 21 Oct 2025, 17:43 UTC (after 2 h 36 min)
- Impact
- Major
- Affected
- Channels REST API, Channels WebSocket client API, Channels Stats Integrations
Last update from Pusher
## **Root Cause Analysis: Elevated API Errors and Outage in AP4 Cluster** **Incident Date:** October 20, 2025 **Status:** Resolved ### **Summary** Between **October 20 and October 21, 2025**, customers using the **AP4 cluster** experienced elevated API errors, latency, and message publishing failures. The issue primarily affected the **Channels API**, preventing customers from publishing new messages and leading to degraded real-time functionality for end-users. During system recovery and while implementing mitigations from a previous incident on Oct 18th, a **misconfigured Redis container** in the AP4 cluster failed to start correctly, preventing caching operations needed for API reque...
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