Pinecone change history: [Serverless][GCP][us-central1] 5xx errors on some read operations for some namespaces

Pinecone reported a major incident affecting Serverless Indexes in GCP us-central1, with 5xx errors on some read operations for some namespaces. It ran from 2025-12-05 18:36 UTC to 2025-12-05 20:42 UTC, lasting 2 h 6 min. A fix was implemented by 20:01 UTC; no cause was stated.