At the time, HostMonitor reported no swap left so a check was made to confirm using an OS command, i.e.
swap -s
total: 666728192k bytes allocated + 76093528k reserved = 742821720k used, 3790289584k available
so, a clear discrepancy.
The fix was worked such that the agent could handle multi-Terabyte swap configurations. Hot-fix for Bundled agents - 7.3.1.103 - was supplied. Please contact Veritas Technical Support for the hot-fix.