Chore: Remove MetricCategoryCascader from Explore Metrics (#91039)

remove MetricCategoryCascader

public/app/features/trails/MetricCategory/MetricCategoryCascader.tsx

@@ -1,62 +0,0 @@
-import { useMemo } from 'react';
-
-import { Cascader, CascaderOption } from '@grafana/ui';
-
-import { useMetricCategories } from './useMetricCategories';
-
-type Props = {
-  metricNames: string[];
-  onSelect: (prefix: string | undefined) => void;
-  disabled?: boolean;
-  initialValue?: string;
-};
-
-export function MetricCategoryCascader({ metricNames, onSelect, disabled, initialValue }: Props) {
-  const categoryTree = useMetricCategories(metricNames);
-  const options = useMemo(() => createCasaderOptions(categoryTree), [categoryTree]);
-
-  return (
-    <Cascader
-      displayAllSelectedLevels={true}
-      width={40}
-      separator="_"
-      hideActiveLevelLabel={false}
-      placeholder={'No filter'}
-      isClearable
-      onSelect={(prefix) => {
-        onSelect(prefix);
-      }}
-      {...{ options, disabled, initialValue }}
-    />
-  );
-}
-
-function createCasaderOptions(tree: ReturnType<typeof useMetricCategories>, currentPrefix = '') {
-  const categories = Object.entries(tree.children);
-
-  const options = categories.map(([metricPart, node]) => {
-    let subcategoryEntries = Object.entries(node.children);
-
-    while (subcategoryEntries.length === 1 && !node.isMetric) {
-      // There is only one subcategory, so we will join it with the current metricPart to reduce depth
-      const [subMetricPart, subNode] = subcategoryEntries[0];
-      metricPart = `${metricPart}_${subMetricPart}`;
-      // Extend the metric part name, because there is only one subcategory
-      node = subNode;
-      subcategoryEntries = Object.entries(node.children);
-    }
-
-    const value = currentPrefix + metricPart;
-    const subOptions = createCasaderOptions(node, value + '_');
-
-    const option: CascaderOption = {
-      value: value,
-      label: metricPart,
-      items: subOptions,
-    };
-
-    return option;
-  });
-
-  return options;
-}

public/app/features/trails/MetricCategory/useMetricCategories.ts

@@ -1,43 +0,0 @@
-import { useMemo } from 'react';
-
-export function useMetricCategories(metrics: string[]) {
-  return useMemo(() => processMetrics(metrics), [metrics]);
-}
-
-interface MetricPartNode {
-  isMetric?: boolean;
-  children: Record<string, MetricPartNode>;
-}
-
-function processMetrics(metrics: string[]) {
-  const categoryTree: MetricPartNode = { children: {} };
-
-  function insertMetric(metric: string) {
-    if (metric.indexOf(':') !== -1) {
-      // Ignore recording rules.
-      return;
-    }
-
-    const metricParts = metric.split('_');
-
-    let cursor = categoryTree;
-    for (const metricPart of metricParts) {
-      let node = cursor.children[metricPart];
-      if (!node) {
-        // Create new node
-        node = {
-          children: {},
-        };
-        // Insert it
-        cursor.children[metricPart] = node;
-      }
-      cursor = node;
-    }
-    // We know this node is a metric because it was for the last metricPart
-    cursor.isMetric = true;
-  }
-
-  metrics.forEach((metric) => insertMetric(metric));
-
-  return categoryTree;
-}