There is no total current connection displayed in the checkpoint firewall devices monitoring.
Release : 3.7, 20.2
Component : IM Reporting / Admin / Configuration
The Vendor Certification (VC) "Checkpoint Firewall Connection" (internal name CheckpointFwConnectionMib) provides the metric "Total Connections"
Vendor Priority Grouping can be used to add that to the already discovered VC (It only provides two statistics which is why grouping the VC instead of moving it up in the priority is recommended).
1) Verify the VC is supported for the device in question at the DX Netops Certification Portal:
https://netops-certification.broadcom.com
2) Documentation outlining Vendor Certification priority grouping:
https://techdocs.broadcom.com/us/en/ca-enterprise-software/it-operations-management/performance-management/20-2/building/self-certification/manage-vendor-certification-priorities.html#concept.dita_65250afe9c5fda6341a8bde6df1d05087930a01b_GroupVendorCertificationPriorities
To find the internal name of a Vendor Certification:
https://knowledge.broadcom.com/external/article?articleId=131183
To find the internal name of a Metric Family:
https://knowledge.broadcom.com/external/article?articleId=131177