The ARN of the rule groups namespace. For example, arn:aws:aps:<region>:123456789012:rulegroupsnamespace/ws-example1-1234-abcd-5678-ef90abcd1234/rulesfile1.
arn:aws:aps:<region>:123456789012:rulegroupsnamespace/ws-example1-1234-abcd-5678-ef90abcd1234/rulesfile1