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+`set-severity()`: new rewrite rule for changing message severity
+
+`set-severity()` receives a template and sets message severity by evaluating the
+template.
+
+Numerical and textual severity levels are both supported.
+
+Examples:
+
+```
+rewrite {
+  set-severity("info");
+  set-severity("6");
+  set-severity("${.json.severity}");
+};
+```