Amazon CloudWatch Application Insights supports Oracle database monitoring

Now enterprises with Oracle databases can easily setup monitoring, alerting and dashboards for their EC2 and RDS Oracle instances on AWS with CloudWatch Application Insights. CloudWatch Application Insights is a capability that helps customers simply setup monitoring and enhanced observability for their enterprise applications running on AWS resources. The new feature automatically setups the metrics, telemetry and logs for monitoring the health and wellness of Oracle databases running in AWS. 

Source:: Amazon AWS