[Serverless] Observability side navigation (#160620)

fixes: https://github.com/elastic/kibana/issues/159681
fixes: https://github.com/elastic/kibana/issues/153777


<img width="1470" alt="image"
src="eb810c65-c780-4597-9570-4b30cf2e1b09">


### Related
ML deep links won't show until it's merged
https://github.com/elastic/kibana/pull/159433

### Test
- e2e will be covered https://github.com/elastic/kibana/pull/160674

test/plugin_functional/test_suites/core_plugins/rendering.ts

@@ -189,6 +189,8 @@ export default function ({ getService }: PluginFunctionalProviderContext) {
         'xpack.apm.featureFlags.migrationToFleetAvailable (any)',
         'xpack.apm.featureFlags.sourcemapApiAvailable (any)',
         'xpack.apm.featureFlags.storageExplorerAvailable (any)',
+        'xpack.apm.serverless.enabled (any)', // It's a boolean (any because schema.conditional)
+        'xpack.observability_onboarding.serverless.enabled (any)', // It's a boolean (any because schema.conditional)
         'xpack.cases.files.allowedMimeTypes (array)',
         'xpack.cases.files.maxSize (number)',
         'xpack.cases.markdownPlugins.lens (boolean)',

x-pack/plugins/apm/public/context/apm_plugin/mock_apm_plugin_context.tsx

@@ -80,6 +80,7 @@ const mockConfig: ConfigSchema = {
     sourcemapApiAvailable: true,
     storageExplorerAvailable: true,
   },
+  serverless: { enabled: false },
 };
 
 const urlService = new UrlService({

x-pack/plugins/apm/public/index.ts

@@ -25,6 +25,9 @@ export interface ConfigSchema {
     sourcemapApiAvailable: boolean;
     storageExplorerAvailable: boolean;
   };
+  serverless: {
+    enabled: boolean;
+  };
 }
 
 export const plugin: PluginInitializer<ApmPluginSetup, ApmPluginStart> = (

x-pack/plugins/apm/public/plugin.ts

@@ -11,6 +11,7 @@ import { map } from 'rxjs/operators';
 import { UsageCollectionStart } from '@kbn/usage-collection-plugin/public';
 import {
   AppMountParameters,
+  AppNavLinkStatus,
   CoreSetup,
   CoreStart,
   DEFAULT_APP_CATEGORIES,
@@ -321,6 +322,7 @@ export class ApmPlugin implements Plugin<ApmPluginSetup, ApmPluginStart> {
       appRoute: '/app/apm',
       icon: 'plugins/apm/public/icon.svg',
       category: DEFAULT_APP_CATEGORIES.observability,
+      navLinkStatus: AppNavLinkStatus.visible,
       deepLinks: [
         {
           id: 'service-groups-list',
@@ -331,13 +333,26 @@ export class ApmPlugin implements Plugin<ApmPluginSetup, ApmPluginStart> {
           id: 'services',
           title: servicesTitle,
           path: '/services',
+          navLinkStatus: config.serverless.enabled
+            ? AppNavLinkStatus.visible
+            : AppNavLinkStatus.default,
+        },
+        {
+          id: 'traces',
+          title: tracesTitle,
+          path: '/traces',
+          navLinkStatus: config.serverless.enabled
+            ? AppNavLinkStatus.visible
+            : AppNavLinkStatus.default,
         },
-        { id: 'traces', title: tracesTitle, path: '/traces' },
         { id: 'service-map', title: serviceMapTitle, path: '/service-map' },
         {
           id: 'dependencies',
           title: dependenciesTitle,
           path: '/dependencies/inventory',
+          navLinkStatus: config.serverless.enabled
+            ? AppNavLinkStatus.visible
+            : AppNavLinkStatus.default,
         },
         { id: 'settings', title: apmSettingsTitle, path: '/settings' },
         {

x-pack/plugins/apm/server/index.ts

@@ -89,6 +89,15 @@ const configSchema = schema.object({
     sourcemapApiAvailable: disabledOnServerless,
     storageExplorerAvailable: disabledOnServerless,
   }),
+  serverless: schema.object({
+    enabled: schema.conditional(
+      schema.contextRef('serverless'),
+      true,
+      schema.literal(true),
+      schema.never(),
+      { defaultValue: schema.contextRef('serverless') }
+    ),
+  }),
 });
 
 // plugin config
@@ -150,6 +159,7 @@ export const config: PluginConfigDescriptor<APMConfig> = {
     managedServiceUrl: true,
     serverlessOnboarding: true,
     featureFlags: true,
+    serverless: true,
   },
   schema: configSchema,
 };

x-pack/plugins/observability_onboarding/public/plugin.ts

@@ -54,6 +54,7 @@ export class ObservabilityOnboardingPlugin
   ) {
     const {
       ui: { enabled: isObservabilityOnboardingUiEnabled },
+      serverless: { enabled: isServerlessEnabled },
     } = this.ctx.config.get<ObservabilityOnboardingConfig>();
 
     const pluginSetupDeps = plugins;
@@ -62,7 +63,9 @@ export class ObservabilityOnboardingPlugin
     // and go to /app/observabilityOnboarding
     if (isObservabilityOnboardingUiEnabled) {
       core.application.register({
-        navLinkStatus: AppNavLinkStatus.hidden,
+        navLinkStatus: isServerlessEnabled
+          ? AppNavLinkStatus.visible
+          : AppNavLinkStatus.hidden,
         id: 'observabilityOnboarding',
         title: 'Observability Onboarding',
         order: 8500,

x-pack/plugins/observability_onboarding/server/index.ts

@@ -16,6 +16,15 @@ const configSchema = schema.object({
   ui: schema.object({
     enabled: schema.boolean({ defaultValue: true }),
   }),
+  serverless: schema.object({
+    enabled: schema.conditional(
+      schema.contextRef('serverless'),
+      true,
+      schema.literal(true),
+      schema.never(),
+      { defaultValue: schema.contextRef('serverless') }
+    ),
+  }),
 });
 
 export type ObservabilityOnboardingConfig = TypeOf<typeof configSchema>;
@@ -24,6 +33,7 @@ export type ObservabilityOnboardingConfig = TypeOf<typeof configSchema>;
 export const config: PluginConfigDescriptor<ObservabilityOnboardingConfig> = {
   exposeToBrowser: {
     ui: true,
+    serverless: true,
   },
   schema: configSchema,
 };

x-pack/plugins/serverless_observability/public/components/side_navigation/index.tsx

@@ -28,14 +28,22 @@ const navigationTree: NavigationTreeDefinition = {
       breadcrumbStatus: 'hidden',
       children: [
         {
-          id: 'services-infra',
+          id: 'discover-dashboard-viz',
           children: [
-            { link: 'apm:services' },
             {
-              title: i18n.translate('xpack.serverlessObservability.nav.infrastructure', {
-                defaultMessage: 'Infrastructure',
+              link: 'discover',
+            },
+            {
+              title: i18n.translate('xpack.serverlessObservability.nav.dashboards', {
+                defaultMessage: 'Dashboards',
               }),
-              link: 'metrics:inventory',
+              link: 'dashboards',
+            },
+            {
+              title: i18n.translate('xpack.serverlessObservability.nav.visualizations', {
+                defaultMessage: 'Visualizations',
+              }),
+              link: 'visualize',
             },
           ],
         },
@@ -54,32 +62,21 @@ const navigationTree: NavigationTreeDefinition = {
           ],
         },
         {
-          id: 'signals',
-          title: 'Signals',
+          id: 'apm',
+          title: 'APM',
           children: [
+            { link: 'apm:services' },
             {
               link: 'apm:traces',
             },
             {
-              title: i18n.translate('xpack.serverlessObservability.nav.signalsLogs', {
+              title: i18n.translate('xpack.serverlessObservability.nav.logs', {
                 defaultMessage: 'Logs',
               }),
               link: 'logs:stream',
             },
-          ],
-        },
-        {
-          id: 'toolbox',
-          title: 'Toolbox',
-          children: [
             {
-              title: i18n.translate('xpack.serverlessObservability.nav.toolBoxVisualization', {
-                defaultMessage: 'Visualization',
-              }),
-              link: 'visualize',
-            },
-            {
-              link: 'dashboards',
+              link: 'apm:dependencies',
             },
           ],
         },
@@ -97,14 +94,6 @@ const navigationTree: NavigationTreeDefinition = {
         },
       ],
     },
-    {
-      type: 'navGroup',
-      ...getPresets('analytics'),
-    },
-    {
-      type: 'navGroup',
-      ...getPresets('ml'),
-    },
   ],
   footer: [
     {