Pinecone change history: [Serverless][AWS][us-west-2] 5xx errors on read path operations for some namespaces

Pinecone reported a major incident causing 5xx errors on read-path operations for some Serverless namespaces in AWS us-west-2, affecting customer reads. It started at 2025-12-03 15:53 UTC and was resolved at 2025-12-03 16:40 UTC, lasting 46 min; Pinecone implemented a fix but did not state a cause.