[docs][cloud] YSQL Ops known issue (yugabyte#11585)

docs/content/latest/yugabyte-cloud/release-notes.md

@@ -146,6 +146,8 @@ The following **AWS regions** are available:
 - **Tables** - In some instances in free clusters, the **Tables** tab will show all tables with a size of 0B.
 - **Clusters** - No support for scaling vCPUs on single node clusters.
 - **Metrics** - The **View Full Screen** option in charts on the cluster **Overview** and **Performance Metrics** pages does not work in some versions of Safari 14.0 (Big Sur).
+- **Metrics** - Some clusters in European regions may show occasional spikes in the YSQL Operations/sec chart. This is due to cluster health checks and can be ignored.
+- **Invoices** - Redundant "Disk Storage (Paused)" entry on invoices for paused clusters. The entry has no effect on your invoice.
 
 ### Known issues in Cloud Shell