The aws probe is set to monitor an RDS instance that is current down yet Metric views shows data points with 28.
Why do are we seeing Estimated Charges for an RDS instance that is down?
Any aws probe version
Estimated Charges is data calculated from Cloudwatch API. The probe collects this information on service level and not on Instance level every 24 hours and uses cached value for other poll cycles.
Every AWS account does not have access to get Billing information. The designated user should have admin level account or it should be linked account to fetch billing information.