Add warning that live dashboard is deprecated (#3359)

diff --git a/ui/src/app/dashboard/components/overview/dashboard-overview.component.html b/ui/src/app/dashboard/components/overview/dashboard-overview.component.html
index e51199a..4e5aeee 100644
--- a/ui/src/app/dashboard/components/overview/dashboard-overview.component.html
+++ b/ui/src/app/dashboard/components/overview/dashboard-overview.component.html
@@ -43,6 +43,17 @@
             </button>
         </div>
 
+        <div fxLayout="column">
+            <div class="warning" fxLayout="row" fxLayoutAlign="start center">
+                <i class="material-icons warning-icon">warning</i>
+                <span
+                    >Warning: The Live Dashboard will be removed in future
+                    versions. The live refresh feature has been integrated into
+                    the Data Explorer. Please migrate your current dashboards to
+                    the Data Explorer!</span
+                >
+            </div>
+        </div>
         <div fxFlex="100" fxLayout="column">
             <sp-basic-header-title-component
                 title="Dashboards"
diff --git a/ui/src/app/dashboard/components/overview/dashboard-overview.component.scss b/ui/src/app/dashboard/components/overview/dashboard-overview.component.scss
index 2384389..74f138c 100644
--- a/ui/src/app/dashboard/components/overview/dashboard-overview.component.scss
+++ b/ui/src/app/dashboard/components/overview/dashboard-overview.component.scss
@@ -35,3 +35,18 @@
     display: inline;
     margin-right: 10px;
 }
+
+.warning {
+    border: 1px solid #dea843;
+    background: #ececc9;
+    padding: 10px;
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    box-sizing: border-box;
+}
+
+.warning-icon {
+    color: #dea843;
+    font-size: 24px;
+}