Pinecone change history: [Serverless][AWS][us-east-1] 5xx errors on read operations for some indexes

Pinecone reported a major incident causing 5xx errors on read operations for some Serverless indexes in AWS us-east-1. It started at 2026-01-15 12:12 UTC and was resolved at 2026-01-15 15:30 UTC, lasting 3 h 18 min. A fix was implemented by 2026-01-15 14:30 UTC; no cause was stated.