I tried:
vob.net.vmnic.linkstate.down
vob.net.vmnic.linkstate.up
esx.problem.net.dvport.redundancy.degraded
esx.clear.net.dvport.redundancy.restored
esx.problem.net.dvport.redundancy.degraded
esx.clear.net.dvport.redundancy.restored
And the last pair did the trick.
Alert is immediately triggered and if link is reconnected, alert is cleared.
Thanks for help.