Hi Michael,
I have not found a trap so far for this one but i can suggest a workaround with a little configuration overhead but it should work.
Create a log filter for edgesafegaurd disabling a port
"create log filter forEdgesafe"
"configure log filter forEdgesafe add events STP.DsblPortLoopDtect match string Safeguard"
Create a syslog and map the log filter created above
"configure syslog add
local0"
"configure log target syslog local0 filter "forEdgesafe"
"enable log target syslog local0 vr "
Create an alarm in Netsight with custom criteria