The Bulk PM feature consists of two main parts:

• Event-driven bulk transfer of monitoring data from an xNF to ONAP/DCAE. A micro-service will listen for 'FileReady' VES events sent from an xNF via the VES collector. Once files become available the collector micro-service will fetch them using protocol such as FTPES (committed) or SFTP. The collected data files are published internally on a DMaaP Data Router (DR) feed. (committed goal for Casablanca release)

For More Details:

https://wiki.onap.org/display/DW/5G+-+Bulk+PM+-+Integration+Test+Cases