Yes, you can do that. ikegami's code passed a reference to the array, which is better if the array is large, or necessary if you are passing multiple arguments (e.g. multiple arrays) to a function. I'm not sure it matters here. And then the sub would be something like:

sub process {
  my $alert = shift;
  print "$_" for @$alert;
  # Or (since I'm not sure what you're doing with this)
  for my $line (@$alert) {
    # process $line of alert
  }
}
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If you asking about the 'if @alert' part, then that's just like:

if (@alert) {
  process(@alert)
}
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and the array (@alert) is true in boolean context if it contains any elements (false if it has zero, of course).