Regarding the tablespace, it should be working as Foglight filters the tablespace according to one of the metrics. This means that by default Foglight will filter the dropped databases according to the collection frequency (24 * collection frequency), if the frequency is 4h (hours), it means that the refresh will take place after 24*4=96h.
The collection frequencies are under Database | Agent Settings | Administration | Collection Frequencies
Datafile I/O activity has the same approach .
