Zabbix

........S. [ZBXNEXT-4108] added 'error' argument to add_event()

The add_event() function will use a new 'error' argument for storing
error messages for internal events. In all the places where the
function is called, pass a proper string if it is an internal trigger or
item event or NULL for everything else.
To note that, as per spec, internal recovery event will not store a value
in the name field. the new field is marked as unused for the moment
until next diffs will introduce the complete processing.