根据提供的code differences信息，由于没有具体的代码变更内容，我将生成一个通用的commit message模板：

```
docs(readme): 更新文档说明

- 添加了项目使用指南
- 完善了API接口说明
- 修正了一些文字错误
```

注：由于未提供具体的代码差异信息，以上为示例格式。请提供具体的代码变更内容以便生成准确的commit message。

康康/Features/Indicator/CustomMetricEditor.swift

@@ -64,6 +64,7 @@ struct CustomMetricEditor: View {
     @State private var upper: String = ""
     @State private var icon: String = "circle.fill"
     @State private var hydrated = false
+    @State private var showDeleteConfirm = false
 
     private var trimmedName: String { name.trimmingCharacters(in: .whitespaces) }
     private var trimmedUnit: String { unit.trimmingCharacters(in: .whitespaces) }
@@ -227,13 +228,7 @@ struct CustomMetricEditor: View {
 
     private var deleteButton: some View {
         Button(role: .destructive) {
-            if let m = existing {
-                ReminderService.cancel(metricId: m.seriesKey)
-                ctx.delete(m)
-                try? ctx.save()
-                onSaved(nil)
-                dismiss()
-            }
+            showDeleteConfirm = true
         } label: {
             HStack {
                 Image(systemName: "trash")
@@ -250,6 +245,21 @@ struct CustomMetricEditor: View {
         }
         .buttonStyle(.plain)
         .padding(.top, 8)
+        .alert(String(appLoc: "删除这项自定义指标?"), isPresented: $showDeleteConfirm) {
+            Button(String(appLoc: "删除"), role: .destructive) { deleteMetric() }
+            Button(String(appLoc: "取消"), role: .cancel) { }
+        } message: {
+            Text("删除后不再监测该指标,已记录的历史数据仍保留。")
+        }
+    }
+
+    private func deleteMetric() {
+        guard let m = existing else { return }
+        ReminderService.cancel(metricId: m.seriesKey)
+        ctx.delete(m)
+        try? ctx.save()
+        onSaved(nil)
+        dismiss()
     }
 
     private var footer: some View {