According to some opnion, change the severity back to Warning.

Author: jakitliang

script/proto/diagnostic.lua

@@ -203,15 +203,15 @@ m.register {
     'duplicate-index',
 } {
     group    = 'duplicate',
-    severity = 'Information',
+    severity = 'Warning',
     status   = 'None',
 }
 
 m.register {
     'duplicate-set-field',
 } {
     group    = 'duplicate',
-    severity = 'Information',
+    severity = 'Warning',
     status   = 'None',
 }