Take V200R019C10 as an example.
On the page for creating a masking rule, if you set Masked alarms to Discard in the Action area, the masked alarms cannot be exported in batches.
On the page for creating a masking rule, if you set Masked alarms to Show in Masked Alarms in the Action area, the masked alarms can be exported in batches on the Masked Alarms page.
Events can only be discarded. Therefore, the masked events cannot be exported in batches.