diff --git a/web/ui/mantine-ui/src/pages/AlertsPage.tsx b/web/ui/mantine-ui/src/pages/AlertsPage.tsx
index afe3d3db90..a905850628 100644
--- a/web/ui/mantine-ui/src/pages/AlertsPage.tsx
+++ b/web/ui/mantine-ui/src/pages/AlertsPage.tsx
@@ -216,12 +216,12 @@ export default function AlertsPage() {
   // convenient to have in the same file IMO).
   const renderedPageItems = useMemo(
     () =>
-      currentPageGroups.map((g, i) => (
+      currentPageGroups.map((g) => (
         <Card
           shadow="xs"
           withBorder
           p="md"
-          key={i} // TODO: Find a stable and definitely unique key.
+          key={`${g.file}-${g.name}`}
         >
           <Group mb="sm" justify="space-between">
             <Group align="baseline">
diff --git a/web/ui/mantine-ui/src/pages/RulesPage.tsx b/web/ui/mantine-ui/src/pages/RulesPage.tsx
index ef1e1d6243..054bea0939 100644
--- a/web/ui/mantine-ui/src/pages/RulesPage.tsx
+++ b/web/ui/mantine-ui/src/pages/RulesPage.tsx
@@ -86,12 +86,13 @@ export default function RulesPage() {
           (effectiveActivePage - 1) * ruleGroupsPerPage,
           effectiveActivePage * ruleGroupsPerPage
         )
-        .map((g, i) => (
+        .map((g) => (
           <Card
             shadow="xs"
             withBorder
             p="md"
-            key={i} // TODO: Find a stable and definitely unique key.
+            mb="md"
+            key={`${g.file}-${g.name}`}
           >
             <Group mb="sm" justify="space-between">
               <Group align="baseline">