I often like using sprintf for it instead of variable concatentation .. note also using single quotes for the string literals means you don't have to have the escaping backslashes... 
my $message = sprintf '<event_id="ALTER_%d_%d" source="APP">', $tier, 
+$code1;

[download]

Also, to OP: I second blazar's comments, and would also add to them that your assignment of $severity with the two if statements can simply be written as: 
$severity = $code1 ? 1 : 5;

[download]
Though, what's the point of $severity ? It doesn't seem to be used...

In reply to Re^2: the variable is not getting assigned by davidrw
in thread the variable is not getting assigned by s_gaurav1091

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