First create an user with Db_datareader permission and
grant VIEW SERVER STATE
permission
-- Syntax
USE master;
GO
GRANT VIEW SERVER STATE TO UserName;
GO
--
Example
USE master;
GO
GRANT VIEW SERVER STATE TO 'Fareast/TestReaderUser'
OR
GRANT VIEW SERVER STATE TO TestReaderUser
GO
Please comment belo if you know any other step to do the same. - Jainendra Verma