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

Pinecone reported a major incident causing 5xx errors on write operations for some Serverless indexes in AWS us-east-1. It started at 2025-09-09 12:55 UTC and was resolved at 2025-09-09 14:40 UTC, lasting 1 h 44 min; a fix was implemented at 09-09 13:43 UTC.