diff --git a/.buildkite/pull_requests.json b/.buildkite/pull_requests.json
index d0d8e8a561b3..0929beea93ef 100644
--- a/.buildkite/pull_requests.json
+++ b/.buildkite/pull_requests.json
@@ -41,7 +41,10 @@
       "kibana_build_reuse_pipeline_slugs": ["kibana-pull-request", "kibana-on-merge"],
       "kibana_build_reuse_regexes": [
         "^test/",
+        "^x-pack/platform/test/",
+        "^x-pack/solutions/(search|observability|security)/test/",
         "^x-pack/test/",
+        "^x-pack/test_serverless/",
         "/__snapshots__/",
         "\\.test\\.(ts|tsx|js|jsx)"
       ]
@@ -67,6 +70,9 @@
       "kibana_build_reuse_regexes": [
         "^test/",
         "^x-pack/test/",
+        "^x-pack/test_serverless/",
+        "^x-pack/platform/test/",
+        "^x-pack/solutions/(search|observability|security)/test/",
         "/__snapshots__/",
         "\\.test\\.(ts|tsx|js|jsx)"
       ]
@@ -92,6 +98,9 @@
       "kibana_build_reuse_regexes": [
         "^test/",
         "^x-pack/test/",
+        "^x-pack/test_serverless/",
+        "^x-pack/platform/test/",
+        "^x-pack/solutions/(search|observability|security)/test/",
         "/__snapshots__/",
         "\\.test\\.(ts|tsx|js|jsx)"
       ]
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 919c5a25b808..1f31d57b65ea 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -1409,6 +1409,7 @@ src/platform/plugins/shared/discover/public/context_awareness/profile_providers/
 /x-pack/solutions/observability/plugins/infra/server/services/rules @elastic/obs-ux-infra_services-team @elastic/obs-ux-logs-team
 /x-pack/test/common/utils/synthtrace @elastic/obs-ux-infra_services-team @elastic/obs-ux-logs-team # Assigned per https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-apm-synthtrace/kibana.jsonc#L5
 /x-pack/test/common/utils/server_route_repository @elastic/obs-knowledge-team
+/src/platform/test/functional/services/synthtrace/logs_synthtrace_es_client.ts @elastic/obs-ux-infra_services-team @elastic/obs-ux-logs-team
 
 ## Streams parts owned by Logs UX
 /x-pack/platform/plugins/shared/streams/server/routes/streams/processing @elastic/obs-ux-logs-team
@@ -1421,6 +1422,8 @@ src/platform/plugins/shared/discover/public/context_awareness/profile_providers/
 /x-pack/test/api_integration/apis/infra @elastic/obs-ux-infra_services-team
 /x-pack/test/functional/apps/infra @elastic/obs-ux-infra_services-team
 /x-pack/test/functional/apps/infra/logs @elastic/obs-ux-logs-team
+/x-pack/solutions/observability/test/api_integration/services/index.ts @elastic/obs-ux-infra_services-team
+/x-pack/solutions/observability/test/api_integration/services/infra_log_views.ts @elastic/obs-ux-infra_services-team
 
 # Observability UX management team
 /src/platform/test/api_integration/apis/suggestions  @elastic/obs-ux-management-team # Assigned per https://github.com/elastic/kibana/pull/200950#discussion_r1853705079
@@ -1447,6 +1450,7 @@ src/platform/plugins/shared/discover/public/context_awareness/profile_providers/
 /x-pack/test/api_integration/deployment_agnostic/services/synthetics_monitors @elastic/obs-ux-management-team
 /x-pack/test/api_integration/deployment_agnostic/services/synthetics_private_location @elastic/obs-ux-management-team
 /x-pack/test/api_integration/deployment_agnostic/apis/observability/incident_management/ @elastic/obs-ux-management-team
+/x-pack/solutions/observability/test/api_integration_deployment_agnostic/services @elastic/obs-ux-management-team
 /x-pack/test/functional/page_objects/alert_controls.ts @elastic/obs-ux-management-team
 
 # Elastic Stack Monitoring
@@ -1485,6 +1489,7 @@ src/platform/plugins/shared/discover/public/context_awareness/profile_providers/
 /src/platform/packages/shared/kbn-utility-types/src/dot.ts @dgieselaar
 /src/platform/packages/shared/kbn-utility-types/src/dot_test.ts @dgieselaar
 /x-pack/test_serverless/api_integration/test_suites/observability/apm_api_integration/ @elastic/obs-ux-infra_services-team
+/x-pack/solutions/observability/test/apm_api_integration/ @elastic/obs-ux-infra_services-team
 #CC# /src/plugins/apm_oss/ @elastic/apm-ui
 #CC# /x-pack/plugins/observability_solution/observability/ @elastic/apm-ui
 
@@ -1682,6 +1687,8 @@ src/platform/plugins/shared/discover/public/context_awareness/profile_providers/
 /src/platform/packages/shared/kbn-es/src/serverless_resources/project_roles/es/roles.yml @elastic/appex-qa
 /src/platform/packages/shared/kbn-es/src/serverless_resources/project_roles/oblt/roles.yml @elastic/appex-qa
 /src/platform/packages/shared/kbn-es/src/serverless_resources/project_roles/security/roles.yml @elastic/appex-qa
+/x-pack/platform/test/common/ftr_provider_context.ts @elastic/appex-qa
+/x-pack/platform/test/common/lib/test_data_loader.ts @elastic/appex-qa # temporarily
 /x-pack/platform/plugins/shared/maps/ui_tests @elastic/appex-qa # temporarily
 /x-pack/platform/plugins/private/discover_enhanced/ui_tests/ @elastic/appex-qa # temporarily
 /x-pack/platform/plugins/private/discover_enhanced/ui_tests/tests/discover_cdp_perf.spec.ts @elastic/kibana-data-discovery # test tracks bundle size limits
@@ -1835,6 +1842,21 @@ src/platform/plugins/shared/discover/public/context_awareness/profile_providers/
 /x-pack/test/api_integration/deployment_agnostic/README.md @elastic/appex-qa
 /x-pack/test/api_integration/deployment_agnostic/*configs/ @elastic/appex-qa
 /x-pack/test/api_integration/deployment_agnostic/services/ @elastic/appex-qa
+/x-pack/platform/test/api_integration_deployment_agnostic/ @elastic/appex-qa
+/x-pack/platform/test/kibana.jsonc @elastic/appex-qa
+/x-pack/platform/test/tsconfig.json @elastic/appex-qa
+/x-pack/platform/test/api_integration_basic/config.basic_license.ts @elastic/appex-qa
+/x-pack/platform/test/api_integration_basic/ftr_provider_context.d.ts @elastic/appex-qa
+/x-pack/solutions/observability/test/kibana.jsonc @elastic/appex-qa
+/x-pack/solutions/observability/test/tsconfig.json @elastic/appex-qa
+/x-pack/solutions/observability/test/api_integration/config.ts @elastic/appex-qa
+/x-pack/solutions/observability/test/api_integration/ftr_provider_context.d.ts @elastic/appex-qa
+/x-pack/solutions/observability/test/api_integration_deployment_agnostic/ftr_provider_context.d.ts @elastic/appex-qa
+/x-pack/solutions/security/test/kibana.jsonc @elastic/appex-qa
+/x-pack/solutions/security/test/tsconfig.json @elastic/appex-qa
+/x-pack/solutions/security/test/api_integration/config.ts @elastic/appex-qa
+/x-pack/solutions/security/test/api_integration/ftr_provider_context.d.ts @elastic/appex-qa
+/x-pack/solutions/security/test/api_integration/services/index.ts @elastic/appex-qa
 
 # Core
 /src/platform/test/api_integration/fixtures/kbn_archiver/management/saved_objects/relationships.json @elastic/kibana-core @elastic/kibana-data-discovery
@@ -1891,6 +1913,8 @@ src/platform/plugins/shared/discover/public/context_awareness/profile_providers/
 /src/platform/test/node_roles_functional @elastic/kibana-core
 /src/platform/test/functional/page_objects/newsfeed_page.ts @elastic/kibana-core # assigned per https://github.com/elastic/kibana/pull/160210
 /src/platform/test/functional/page_objects/home_page.ts @elastic/appex-sharedux
+/src/platform/test/functional/page_objects/export_page.ts @elastic/kibana-sharedux
+/src/platform/test/functional/page_objects/solution_navigation.ts @elastic/kibana-sharedux
 /src/platform/test/functional/fixtures/es_archiver/deprecations_service @elastic/kibana-core
 /src/platform/test/health_gateway @elastic/kibana-core
 /src/platform/test/api_integration/apis/saved_objects* @elastic/kibana-core
diff --git a/packages/kbn-repo-source-classifier/src/group.ts b/packages/kbn-repo-source-classifier/src/group.ts
index 944eba9e9ef4..f99ea0243e0e 100644
--- a/packages/kbn-repo-source-classifier/src/group.ts
+++ b/packages/kbn-repo-source-classifier/src/group.ts
@@ -46,6 +46,10 @@ const MODULE_GROUPING_BY_PATH: Record<string, ModuleAttrs> = ['packages', 'plugi
         group: solution,
         visibility: 'private',
       };
+      acc[`x-pack/solutions/${solution}/test`] = {
+        group: solution,
+        visibility: 'private',
+      };
       return acc;
     }, {}),
   }))
@@ -54,6 +58,10 @@ const MODULE_GROUPING_BY_PATH: Record<string, ModuleAttrs> = ['packages', 'plugi
       group: 'platform',
       visibility: 'shared',
     },
+    'x-pack/platform/test': {
+      group: 'platform',
+      visibility: 'shared',
+    },
   });
 
 /**
diff --git a/src/platform/packages/private/kbn-repo-packages/modern/package.js b/src/platform/packages/private/kbn-repo-packages/modern/package.js
index f131aee6c853..fc145e51aad4 100644
--- a/src/platform/packages/private/kbn-repo-packages/modern/package.js
+++ b/src/platform/packages/private/kbn-repo-packages/modern/package.js
@@ -193,7 +193,10 @@ class Package {
     const example = dir.startsWith('examples/') || dir.startsWith('x-pack/examples/');
     const testPlugin =
       dir.startsWith('src/platform/test/') ||
-      dir.startsWith('x-pack/platform/test') ||
+      dir.startsWith('x-pack/platform/test/') ||
+      dir.startsWith('x-pack/solutions/search/test/') ||
+      dir.startsWith('x-pack/solutions/observability/test/') ||
+      dir.startsWith('x-pack/solutions/security/test/') ||
       dir.startsWith('x-pack/test/');
 
     return {
diff --git a/src/platform/packages/shared/kbn-test/src/functional_test_runner/cli/code_owners.ts b/src/platform/packages/shared/kbn-test/src/functional_test_runner/cli/code_owners.ts
index 62948bbfcde5..830f64506945 100644
--- a/src/platform/packages/shared/kbn-test/src/functional_test_runner/cli/code_owners.ts
+++ b/src/platform/packages/shared/kbn-test/src/functional_test_runner/cli/code_owners.ts
@@ -13,7 +13,16 @@ import { getRepoFiles } from '@kbn/get-repo-files';
 import { getCodeOwnersEntries } from '@kbn/code-owners';
 import ignore from 'ignore';
 
-const TEST_DIRECTORIES = ['test', 'x-pack/test', 'x-pack/test_serverless'];
+const TEST_DIRECTORIES = [
+  'test',
+  'x-pack/test',
+  'x-pack/test_serverless',
+  'src/platform/test',
+  'x-pack/platform/test',
+  'x-pack/solutions/search/test',
+  'x-pack/solutions/observability/test',
+  'x-pack/solutions/security/test',
+];
 
 export async function checkFTRCodeOwnersCLI() {
   await run(
diff --git a/x-pack/platform/test/api_integration/apis/entity_manager/fixture_plugin/kibana.jsonc b/x-pack/platform/test/api_integration/apis/entity_manager/fixture_plugin/kibana.jsonc
index ca3d05aea0f8..fe1e2be06b3e 100644
--- a/x-pack/platform/test/api_integration/apis/entity_manager/fixture_plugin/kibana.jsonc
+++ b/x-pack/platform/test/api_integration/apis/entity_manager/fixture_plugin/kibana.jsonc
@@ -2,6 +2,8 @@
   "type": "plugin",
   "id": "@kbn/entity-manager-fixture-plugin",
   "owner": "@elastic/obs-entities",
+  "group": "platform",
+  "visibility": "private",
   "plugin": {
     "id": "entityManagerFixture",
     "server": true,
diff --git a/x-pack/platform/test/encrypted_saved_objects_api_integration/plugins/api_consumer_plugin/kibana.jsonc b/x-pack/platform/test/encrypted_saved_objects_api_integration/plugins/api_consumer_plugin/kibana.jsonc
index bd9a36c5f137..f49678c1bb12 100644
--- a/x-pack/platform/test/encrypted_saved_objects_api_integration/plugins/api_consumer_plugin/kibana.jsonc
+++ b/x-pack/platform/test/encrypted_saved_objects_api_integration/plugins/api_consumer_plugin/kibana.jsonc
@@ -2,6 +2,8 @@
   "type": "plugin",
   "id": "@kbn/eso-plugin",
   "owner": "@elastic/kibana-security",
+  "group": "platform",
+  "visibility": "private",
   "plugin": {
     "id": "eso",
     "server": true,
diff --git a/x-pack/platform/test/plugin_api_integration/plugins/elasticsearch_client/kibana.jsonc b/x-pack/platform/test/plugin_api_integration/plugins/elasticsearch_client/kibana.jsonc
index 5308edf07bd7..0b3a1b08be28 100644
--- a/x-pack/platform/test/plugin_api_integration/plugins/elasticsearch_client/kibana.jsonc
+++ b/x-pack/platform/test/plugin_api_integration/plugins/elasticsearch_client/kibana.jsonc
@@ -2,6 +2,8 @@
   "type": "plugin",
   "id": "@kbn/elasticsearch-client-xpack-plugin",
   "owner": "@elastic/kibana-core",
+  "group": "platform",
+  "visibility": "private",
   "plugin": {
     "id": "elasticsearchClientXpack",
     "server": true,
diff --git a/x-pack/platform/test/plugin_api_integration/plugins/event_log/kibana.jsonc b/x-pack/platform/test/plugin_api_integration/plugins/event_log/kibana.jsonc
index 9e5702c323cb..e6cc71fd6ecc 100644
--- a/x-pack/platform/test/plugin_api_integration/plugins/event_log/kibana.jsonc
+++ b/x-pack/platform/test/plugin_api_integration/plugins/event_log/kibana.jsonc
@@ -2,6 +2,8 @@
   "type": "plugin",
   "id": "@kbn/event-log-fixture-plugin",
   "owner": "@elastic/response-ops",
+  "group": "platform",
+  "visibility": "private",
   "plugin": {
     "id": "eventLogFixture",
     "server": true,
diff --git a/x-pack/platform/test/plugin_api_integration/plugins/feature_usage_test/kibana.jsonc b/x-pack/platform/test/plugin_api_integration/plugins/feature_usage_test/kibana.jsonc
index a7fe8e0cb237..eadacb9ca780 100644
--- a/x-pack/platform/test/plugin_api_integration/plugins/feature_usage_test/kibana.jsonc
+++ b/x-pack/platform/test/plugin_api_integration/plugins/feature_usage_test/kibana.jsonc
@@ -2,6 +2,8 @@
   "type": "plugin",
   "id": "@kbn/feature-usage-test-plugin",
   "owner": "@elastic/kibana-security",
+  "group": "platform",
+  "visibility": "private",
   "plugin": {
     "id": "featureUsageTest",
     "server": true,
diff --git a/x-pack/platform/test/plugin_api_integration/plugins/sample_task_plugin/kibana.jsonc b/x-pack/platform/test/plugin_api_integration/plugins/sample_task_plugin/kibana.jsonc
index d7e5bdac2e80..4f4678980c66 100644
--- a/x-pack/platform/test/plugin_api_integration/plugins/sample_task_plugin/kibana.jsonc
+++ b/x-pack/platform/test/plugin_api_integration/plugins/sample_task_plugin/kibana.jsonc
@@ -2,6 +2,8 @@
   "type": "plugin",
   "id": "@kbn/sample-task-plugin",
   "owner": "@elastic/response-ops",
+  "group": "platform",
+  "visibility": "private",
   "plugin": {
     "id": "sampleTaskPlugin",
     "server": true,