That information is necessary is you are using this global "policy" in conjunction with sql metrics. So depending on your organization you can specificy SQL access at the policy level or metric level. Obviously you would have cloned multiple policies, targeting separate filters, so each would have his own appropriate access.
At my company, we actually do this at the SQL metric level due to the diversity of queries, targets, and access rights.
So since you said you are just starting out with Monitor Solution, you probably wont need this configured right away. At least until you are monitoring specific SQL database metrics.
HTH