add keys

frontend/src/metabase/xray/components/CostSelect.jsx

@@ -9,7 +9,7 @@ const CostSelect = ({currentCost, onChange}) =>
         onChange={onChange}
     >
         { Object.keys(COSTS).map(cost =>
-            <Option value={cost}>
+            <Option value={cost} key={cost}>
                 {COSTS[cost].display_name}
             </Option>
         )}

frontend/src/metabase/xray/containers/FieldXray.jsx

@@ -31,7 +31,7 @@ const StatGroup = ({ fingerprint, stats, showDescriptions }) =>
     <ol className="Grid Grid--1of3">
         { stats.map(stat =>
             fingerprint[stat] && (
-                <li className="Grid-cell p4 border-right border-bottom">
+                <li className="Grid-cell p4 border-right border-bottom" key={stat}>
                     <SimpleStat
                         stat={fingerprint[stat]}
                         showDescription={showDescriptions}