DatabaseFileStatistics is blank for some of the servers in our Environment.

We could see the DatabaseFileStatistics table doesn't have any record for some of the servers. Few servers have data in this table. Can you please guide me where to enable to collect the Database File Statistics option for particular server alone. We are using Idera DM 10.5.1 version. Also the SQL instance and Database we are expecting to collect data is in AlwaysOn Group.