Integration with AWS Cloudwatch

hi

I am new to Grafana and try to cofnigure the integration of Cloudwatch metrics to be displayed in Grafana. However i see inconsistent guides on the web. One such guide mentioned about creating user (https://www.ceos3c.com/cloud/use-grafana-with-aws-cloudwatch-easy-fast/), roles and policies but Grafana web and few other sites mentioned on role and policy creation - http://docs.grafana.org/features/datasources/cloudwatch/

DO i need to create user and attach the policy to this uer in order to work? Thanks

rgds
WK