[Stack Monitoring] Remove 'observability' and 'observabilityShared' plugin dependencies (#203492)

### Summary
A recent [bug](https://github.com/elastic/kibana/issues/199902) that
affected some of the pages in Stack Monitoring was caused by changes
related to the locators of the logs-related apps.

The goal of this PR is to reduce the number of Observability
dependencies that could potentially cause issues in the app by removing
the `observability` and `observabilityShared` plugin dependencies from
the `monitoring` plugin.

Currently, the `monitoring` plugin is [categorised as
observability](https://github.com/elastic/kibana/blob/main/x-pack/plugins/monitoring/kibana.jsonc#L7)
but when the dependency on the `infra` plugin is removed, it can be
marked as a `platform` plugin.

### Notes for reviewers
- The components used to render the header menu as well as the
[use_track_metric](https://github.com/elastic/kibana/pull/203492/files#diff-7e39fc60ca80ee551d824ca97f9f879e3364a368a5736cf9178b5943a12ca7a7)
hook were copied from the `observabilityShared` plugin
- There should be no UX and functionality changes in the stack
monitoring header
- Usage collection could be verified by searching for UI counters sent
by the cluster created for this PR, once telemetry has been sent

### Testing
The stateful environment deployed by this PR includes logs and metrics
for stack monitoring. Please make sure to select a larger time range
(e.g. last 14 days).

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

x-pack/plugins/monitoring/common/constants.ts

@@ -10,6 +10,8 @@ import { CommonAlertParamDetail, ExpressionConfig } from './types/alerts';
 import { AlertParamType } from './enums';
 import { validateDuration } from './validate_duration';
 
+export const USAGE_COLLECTION_APP_NAME = 'stack_monitoring';
+
 /**
  * Helper string to add as a tag in every logging call
  */

x-pack/plugins/monitoring/kibana.jsonc

@@ -18,8 +18,6 @@
       "features",
       "data",
       "navigation",
-      "observability",
-      "observabilityShared",
       "dataViews",
       "unifiedSearch",
       "share"
@@ -42,4 +40,4 @@
       "kibanaReact",
     ]
   }
-}
+}

x-pack/plugins/monitoring/public/application/hooks/use_track_metric.tsx

@@ -0,0 +1,88 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { useEffect, useMemo } from 'react';
+import { METRIC_TYPE, UiCounterMetricType } from '@kbn/analytics';
+import { UsageCollectionSetup } from '@kbn/usage-collection-plugin/public';
+import { useKibana } from '@kbn/kibana-react-plugin/public';
+import { USAGE_COLLECTION_APP_NAME } from '../../../common/constants';
+
+/**
+ * Note: The usage_collection plugin will take care of sending this data to the telemetry server.
+ * You can find the metrics that are collected by these hooks in Stack Telemetry.
+ * Search the index `kibana-ui-counter`. You can filter for `eventName` and/or `appName`.
+ */
+
+interface TrackOptions {
+  metricType?: UiCounterMetricType;
+  delay?: number; // in ms
+}
+type EffectDeps = unknown[];
+
+interface ServiceDeps {
+  usageCollection: UsageCollectionSetup; // TODO: This should really be start. Looking into it.
+}
+
+export type TrackMetricOptions = TrackOptions & { metric: string };
+export type UiTracker = ReturnType<typeof useUiTracker>;
+export type TrackEvent = (options: TrackMetricOptions) => void;
+
+export { METRIC_TYPE };
+
+export function useUiTracker<Services extends ServiceDeps>(): TrackEvent {
+  const reportUiCounter = useKibana<Services>().services?.usageCollection?.reportUiCounter;
+  const trackEvent = useMemo(() => {
+    return ({ metric, metricType = METRIC_TYPE.COUNT }: TrackMetricOptions) => {
+      if (reportUiCounter) {
+        reportUiCounter(USAGE_COLLECTION_APP_NAME, metricType, metric);
+      }
+    };
+  }, [reportUiCounter]);
+  return trackEvent;
+}
+
+export function useTrackMetric<Services extends ServiceDeps>(
+  { metric, metricType = METRIC_TYPE.COUNT, delay = 0 }: TrackMetricOptions,
+  effectDependencies: EffectDeps = []
+) {
+  const reportUiCounter = useKibana<Services>().services?.usageCollection?.reportUiCounter;
+
+  useEffect(() => {
+    if (!reportUiCounter) {
+      // eslint-disable-next-line no-console
+      console.log(
+        'usageCollection.reportUiCounter is unavailable. Ensure this is setup via <KibanaContextProvider />.'
+      );
+    } else {
+      let decoratedMetric = metric;
+      if (delay > 0) {
+        decoratedMetric += `__delayed_${delay}ms`;
+      }
+      const id = setTimeout(
+        () => reportUiCounter(USAGE_COLLECTION_APP_NAME, metricType, decoratedMetric),
+        Math.max(delay, 0)
+      );
+      return () => clearTimeout(id);
+    }
+    // the dependencies are managed externally
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, effectDependencies);
+}
+
+/**
+ * useTrackPageview is a convenience wrapper for tracking a pageview
+ * Its metrics will be found at:
+ * stack_stats.kibana.plugins.ui_metric.{app}.pageview__{path}(__delayed_{n}ms)?
+ */
+type TrackPageviewProps = TrackOptions & { path: string };
+
+export function useTrackPageview<Services extends ServiceDeps>(
+  { path, ...rest }: TrackPageviewProps,
+  effectDependencies: EffectDeps = []
+) {
+  useTrackMetric<Services>({ ...rest, metric: `pageview__${path}` }, effectDependencies);
+}

x-pack/plugins/monitoring/public/application/pages/page_template.tsx

@@ -9,7 +9,6 @@ import { EuiPage, EuiPageBody, EuiPageTemplate, EuiTab, EuiTabs, EuiSpacer } fro
 import React, { useContext, useState, useEffect, useCallback, FC, PropsWithChildren } from 'react';
 import { useHistory } from 'react-router-dom';
 import type { IHttpFetchError, ResponseErrorBody } from '@kbn/core-http-browser';
-import { HeaderMenuPortal } from '@kbn/observability-shared-plugin/public';
 import { useTitle } from '../hooks/use_title';
 import { MonitoringToolbar } from '../../components/shared/toolbar';
 import { useMonitoringTimeContainerContext } from '../hooks/use_monitoring_time';
@@ -25,6 +24,7 @@ import { AlertsDropdown } from '../../alerts/alerts_dropdown';
 import { useRequestErrorHandler } from '../hooks/use_request_error_handler';
 import { SetupModeToggleButton } from '../../components/setup_mode/toggle_button';
 import { HeaderActionMenuContext } from '../contexts/header_action_menu_context';
+import { HeaderMenuPortal } from '../../components/header_menu';
 
 export interface TabMenuItem {
   id: string;

x-pack/plugins/monitoring/public/components/header_menu/header_menu_portal.test.tsx

@@ -0,0 +1,30 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { render } from '@testing-library/react';
+import React from 'react';
+import HeaderMenuPortal from './header_menu_portal';
+import { themeServiceMock } from '@kbn/core/public/mocks';
+
+describe('HeaderMenuPortal', () => {
+  describe('when unmounted', () => {
+    it('calls setHeaderActionMenu with undefined', () => {
+      const setHeaderActionMenu = jest.fn();
+      const theme$ = themeServiceMock.createTheme$();
+
+      const { unmount } = render(
+        <HeaderMenuPortal setHeaderActionMenu={setHeaderActionMenu} theme$={theme$}>
+          test
+        </HeaderMenuPortal>
+      );
+
+      unmount();
+
+      expect(setHeaderActionMenu).toHaveBeenCalledWith(undefined);
+    });
+  });
+});

x-pack/plugins/monitoring/public/components/header_menu/header_menu_portal.tsx

@@ -0,0 +1,34 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import React, { useEffect, useMemo } from 'react';
+import { createHtmlPortalNode, InPortal, OutPortal } from 'react-reverse-portal';
+import { toMountPoint } from '@kbn/kibana-react-plugin/public';
+import type { HeaderMenuPortalProps } from '../../types';
+
+// eslint-disable-next-line import/no-default-export
+export default function HeaderMenuPortal({
+  children,
+  setHeaderActionMenu,
+  theme$,
+}: HeaderMenuPortalProps) {
+  const portalNode = useMemo(() => createHtmlPortalNode(), []);
+
+  useEffect(() => {
+    setHeaderActionMenu((element) => {
+      const mount = toMountPoint(<OutPortal node={portalNode} />, { theme$ });
+      return mount(element);
+    });
+
+    return () => {
+      portalNode.unmount();
+      setHeaderActionMenu(undefined);
+    };
+  }, [portalNode, setHeaderActionMenu, theme$]);
+
+  return <InPortal node={portalNode}>{children}</InPortal>;
+}

x-pack/plugins/monitoring/public/components/header_menu/index.tsx

@@ -0,0 +1,20 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import React, { lazy, Suspense } from 'react';
+import { EuiLoadingSpinner } from '@elastic/eui';
+import { HeaderMenuPortalProps } from '../../types';
+
+const HeaderMenuPortalLazy = lazy(() => import('./header_menu_portal'));
+
+export function HeaderMenuPortal(props: HeaderMenuPortalProps) {
+  return (
+    <Suspense fallback={<EuiLoadingSpinner />}>
+      <HeaderMenuPortalLazy {...props} />
+    </Suspense>
+  );
+}

x-pack/plugins/monitoring/public/components/page_loading/index.tsx

@@ -8,7 +8,7 @@
 import React from 'react';
 import { EuiPage, EuiPageBody, EuiPageTemplate, EuiLoadingSpinner } from '@elastic/eui';
 import { FormattedMessage } from '@kbn/i18n-react';
-import { useTrackPageview } from '@kbn/observability-shared-plugin/public';
+import { useTrackPageview } from '../../application/hooks/use_track_metric';
 
 function PageLoadingUI() {
   return (
@@ -29,8 +29,8 @@ const PageLoadingTracking: React.FunctionComponent<{ pageViewTitle: string }> =
   pageViewTitle,
 }) => {
   const path = pageViewTitle.toLowerCase().replace(/-/g, '').replace(/\s+/g, '_');
-  useTrackPageview({ app: 'stack_monitoring', path });
-  useTrackPageview({ app: 'stack_monitoring', path, delay: 15000 });
+  useTrackPageview({ path });
+  useTrackPageview({ path, delay: 15000 });
   return <PageLoadingUI />;
 };
 

x-pack/plugins/monitoring/public/components/setup_mode/toggle_button.tsx

@@ -8,9 +8,10 @@
 import React from 'react';
 import { EuiButton } from '@elastic/eui';
 import { i18n } from '@kbn/i18n';
-import { METRIC_TYPE, useUiTracker } from '@kbn/observability-shared-plugin/public';
+import { METRIC_TYPE } from '@kbn/analytics';
 import { TELEMETRY_METRIC_BUTTON_CLICK } from '../../../common/constants';
 import { SetupModeExitButton } from './exit_button';
+import { useUiTracker } from '../../application/hooks/use_track_metric';
 
 export interface SetupModeToggleButtonProps {
   enabled: boolean;
@@ -21,7 +22,7 @@ export const SetupModeToggleButton: React.FC<SetupModeToggleButtonProps> = (
   props: SetupModeToggleButtonProps
 ) => {
   const [isLoading, setIsLoading] = React.useState(false);
-  const trackStat = useUiTracker({ app: 'stack_monitoring' });
+  const trackStat = useUiTracker();
 
   function toggleSetupMode(enabled: boolean, stat: string) {
     setIsLoading(true);

x-pack/plugins/monitoring/public/types.ts

@@ -17,6 +17,7 @@ import { DashboardStart } from '@kbn/dashboard-plugin/public';
 import { FleetStart } from '@kbn/fleet-plugin/public';
 import type { InfraClientStartExports } from '@kbn/infra-plugin/public';
 import { SharePluginStart } from '@kbn/share-plugin/public';
+import { ReactNode } from 'react';
 
 export interface MonitoringStartPluginDependencies {
   navigation: NavigationStart;
@@ -43,3 +44,9 @@ export type LegacyMonitoringStartPluginDependencies = MonitoringStartPluginDepen
   LegacyStartDependencies;
 
 export type MonitoringStartServices = CoreStart & MonitoringStartPluginDependencies;
+
+export interface HeaderMenuPortalProps {
+  children: ReactNode;
+  setHeaderActionMenu: AppMountParameters['setHeaderActionMenu'];
+  theme$: AppMountParameters['theme$'];
+}

x-pack/plugins/monitoring/tsconfig.json

@@ -38,7 +38,6 @@
     "@kbn/dashboard-plugin",
     "@kbn/fleet-plugin",
     "@kbn/shared-ux-router",
-    "@kbn/observability-shared-plugin",
     "@kbn/shared-ux-link-redirect-app",
     "@kbn/alerts-as-data-utils",
     "@kbn/rule-data-utils",
@@ -48,6 +47,7 @@
     "@kbn/ui-theme",
     "@kbn/core-elasticsearch-server",
     "@kbn/share-plugin",
+    "@kbn/analytics",
   ],
   "exclude": [
     "target/**/*",

x-pack/plugins/observability_solution/exploratory_view/public/typings/fetch_overview_data/index.ts

@@ -75,12 +75,7 @@ export type HasData<T extends ObservabilityFetchDataPlugins> = (
 
 export type ObservabilityFetchDataPlugins = Exclude<
   ObservabilityApp,
-  | 'observability-overview'
-  | 'stack_monitoring'
-  | 'fleet'
-  | 'synthetics'
-  | 'profiling'
-  | 'observability-onboarding'
+  'observability-overview' | 'fleet' | 'synthetics' | 'profiling' | 'observability-onboarding'
 >;
 
 export interface DataHandler<

x-pack/plugins/observability_solution/observability/public/typings/fetch_overview_data/index.ts

@@ -80,7 +80,7 @@ export type HasData<T extends ObservabilityFetchDataPlugins> = (
 
 export type ObservabilityFetchDataPlugins = Exclude<
   ObservabilityApp,
-  'observability-overview' | 'stack_monitoring' | 'fleet' | 'synthetics'
+  'observability-overview' | 'fleet' | 'synthetics'
 >;
 
 export interface DataHandler<

x-pack/plugins/observability_solution/observability/typings/common.ts

@@ -15,7 +15,6 @@ export type ObservabilityApp =
   | 'uptime'
   | 'synthetics'
   | 'observability-overview'
-  | 'stack_monitoring'
   | 'ux'
   | 'fleet'
   | 'universal_profiling';

x-pack/plugins/observability_solution/observability_shared/typings/common.ts

@@ -13,7 +13,6 @@ export type ObservabilityApp =
   | 'uptime'
   | 'synthetics'
   | 'observability-overview'
-  | 'stack_monitoring'
   | 'ux'
   | 'fleet'
   | 'profiling'