fix

Author: aMayzner

ui/src/assets/components/data_grid.scss

@@ -52,3 +52,8 @@
     text-overflow: ellipsis;
   }
 }
+
+.pf-distinct-values-menu {
+  max-height: 300px;
+  overflow-y: auto;
+}

ui/src/components/widgets/data_grid/common.ts

@@ -109,6 +109,8 @@ export interface DataGridDataSource {
    * Get distinct values for a column with current filters applied.
    * Returns up to maxValues distinct values, or 'too_many' if there are more.
    * Returns 'error' if the query fails.
+   * Results are cached internally by the data source and invalidated when
+   * filters change.
    */
   getDistinctValues?(
     column: string,