@sysmon_data = ( 
                 { metadata_cache_mgmt => { max_open_databases => { co
+unt => [ {}, {}, {} ] } },
                   cache_mgmt => { spinlock_contention => { per_sec =>
+ [ {}, {}, {} ] } }
                   }
               ) ;
[download]

Doesn't that do it? The {}, {}, {} entry in per_sec would be addressable by index.