Merge branch 'master' into dependabot/npm_and_yarn/express-4.19.2

* master: (3487 commits)
  `BedrockChat` & `GeminiChat` (elastic#186809)
  [ResponseOps] log error when ES Query rules find docs out of time range (elastic#186332)
  skip flaky suite (elastic#188997)
  [Security solution][Alert Details] Enable preview feature flag and cypress tests (elastic#188580)
  [EuiProviders] Warn Developer if EuiProvider is missing (elastic#184608)
  [Security Solution ] Fixes Timeline infinite loading bug (elastic#188943)
  Improve SearchSource SearchRequest type (elastic#186862)
  Deprecate Search Sessions config (elastic#188037)
  [Synthetics] Add missing monitorType and tag info in cards !! (elastic#188824)
  [Console Monaco] Resolve uncaught error from tokenizer (elastic#188746)
  [Data Forge] Add `service.logs` dataset as a  data stream (elastic#188786)
  [Console] Fix failing bulk requests (elastic#188552)
  Update dependency terser to ^5.31.2 (main) (elastic#188528)
  [APM][ECO] Telemetry (elastic#188627)
  [Fleet] Fix uninstall package validation accross space (elastic#188749)
  Update warning on `xpack.fleet.enableExperimental` (elastic#188917)
  [DOCS][Cases] Automate more screenshots for cases (elastic#188697)
  [Fleet] Fix get one agent when feature flag disabled (elastic#188953)
  chore(investigate): Add investigate-app plugin from poc (elastic#188122)
  [Monaco Editor] Add Search functionality (elastic#188337)
  ...

.backportrc.json

@@ -3,6 +3,8 @@
   "repoName": "kibana",
   "targetBranchChoices": [
     "main",
+    "8.15",
+    "8.14",
     "8.13",
     "8.12",
     "8.11",
@@ -50,7 +52,7 @@
     "backport"
   ],
   "branchLabelMapping": {
-    "^v8.14.0$": "main",
+    "^v8.16.0$": "main",
     "^v(\\d+).(\\d+).\\d+$": "$1.$2"
   },
   "autoMerge": true,

.browserslistrc

@@ -3,6 +3,7 @@ last 2 Firefox versions
 last 2 Chrome versions
 last 2 Safari versions
 last 2 Edge versions
+Firefox ESR
 last 1 ios_saf versions
 last 1 and_chr versions
 last 1 samsung versions

.buildkite/ftr_base_serverless_configs.yml

@@ -0,0 +1,7 @@
+disabled:
+  # Base config files, only necessary to inform config finding script
+
+  # Serverless base config files
+  - x-pack/test_serverless/api_integration/config.base.ts
+  - x-pack/test_serverless/functional/config.base.ts
+  - x-pack/test_serverless/shared/config.base.ts

.buildkite/ftr_configs_manifests.json

@@ -0,0 +1,14 @@
+{
+    "stateful": [
+        ".buildkite/ftr_platform_stateful_configs.yml",
+        ".buildkite/ftr_oblt_stateful_configs.yml",
+        ".buildkite/ftr_security_stateful_configs.yml",
+        ".buildkite/ftr_search_stateful_configs.yml"
+    ],
+    "serverless" : [
+        ".buildkite/ftr_base_serverless_configs.yml",
+        ".buildkite/ftr_oblt_serverless_configs.yml",
+        ".buildkite/ftr_security_serverless_configs.yml",
+        ".buildkite/ftr_search_serverless_configs.yml"
+    ]
+}

.buildkite/ftr_oblt_serverless_configs.yml

@@ -0,0 +1,28 @@
+disabled:
+  # Base config files, only necessary to inform config finding script
+  - x-pack/test_serverless/functional/test_suites/observability/cypress/oblt_config.base.ts
+
+  # Cypress configs, for now these are still run manually
+  - x-pack/test_serverless/functional/test_suites/observability/cypress/config_headless.ts
+  - x-pack/test_serverless/functional/test_suites/observability/cypress/config_runner.ts
+
+  # Serverless feature flag config files (move to enabled after tests are added)
+  - x-pack/test_serverless/functional/test_suites/observability/config.feature_flags.ts
+
+defaultQueue: 'n2-4-spot'
+enabled:
+  - x-pack/test_serverless/api_integration/test_suites/observability/config.ts
+  - x-pack/test_serverless/api_integration/test_suites/observability/config.feature_flags.ts
+  - x-pack/test_serverless/api_integration/test_suites/observability/common_configs/config.group1.ts
+  - x-pack/test_serverless/api_integration/test_suites/observability/fleet/config.ts
+  - x-pack/test_serverless/functional/test_suites/observability/config.ts
+  - x-pack/test_serverless/functional/test_suites/observability/config.examples.ts
+  - x-pack/test_serverless/functional/test_suites/observability/config.saved_objects_management.ts
+  - x-pack/test_serverless/functional/test_suites/observability/config.context_awareness.ts
+  - x-pack/test_serverless/functional/test_suites/observability/common_configs/config.group1.ts
+  - x-pack/test_serverless/functional/test_suites/observability/common_configs/config.group2.ts
+  - x-pack/test_serverless/functional/test_suites/observability/common_configs/config.group3.ts
+  - x-pack/test_serverless/functional/test_suites/observability/common_configs/config.group4.ts
+  - x-pack/test_serverless/functional/test_suites/observability/common_configs/config.group5.ts
+  - x-pack/test_serverless/functional/test_suites/observability/common_configs/config.group6.ts
+  - x-pack/test_serverless/functional/test_suites/observability/config.screenshots.ts

.buildkite/ftr_oblt_stateful_configs.yml

@@ -0,0 +1,51 @@
+disabled:
+  # Cypress configs, for now these are still run manually
+  - x-pack/plugins/observability_solution/observability_onboarding/e2e/ftr_config_open.ts
+  - x-pack/plugins/observability_solution/observability_onboarding/e2e/ftr_config_runner.ts
+  - x-pack/plugins/observability_solution/observability_onboarding/e2e/ftr_config.ts
+  - x-pack/plugins/observability_solution/apm/ftr_e2e/ftr_config_open.ts
+  - x-pack/plugins/observability_solution/apm/ftr_e2e/ftr_config_run.ts
+  - x-pack/plugins/observability_solution/apm/ftr_e2e/ftr_config.ts
+  - x-pack/plugins/observability_solution/profiling/e2e/ftr_config_open.ts
+  - x-pack/plugins/observability_solution/profiling/e2e/ftr_config_runner.ts
+  - x-pack/plugins/observability_solution/profiling/e2e/ftr_config.ts
+
+  #FTR configs
+  - x-pack/plugins/observability_solution/uptime/e2e/config.ts
+
+  # Elastic Synthetics configs
+  - x-pack/plugins/observability_solution/uptime/e2e/uptime/synthetics_run.ts
+  - x-pack/plugins/observability_solution/synthetics/e2e/config.ts
+  - x-pack/plugins/observability_solution/synthetics/e2e/synthetics/synthetics_run.ts
+  - x-pack/plugins/observability_solution/exploratory_view/e2e/synthetics_run.ts
+  - x-pack/plugins/observability_solution/ux/e2e/synthetics_run.ts
+  - x-pack/plugins/observability_solution/slo/e2e/synthetics_run.ts
+
+defaultQueue: 'n2-4-spot'
+enabled:
+  - x-pack/test/alerting_api_integration/observability/config.ts
+  - x-pack/test/api_integration/apis/logs_ui/config.ts
+  - x-pack/test/api_integration/apis/metrics_ui/config.ts
+  - x-pack/test/api_integration/apis/osquery/config.ts
+  - x-pack/test/api_integration/apis/synthetics/config.ts
+  - x-pack/test/api_integration/apis/slos/config.ts
+  - x-pack/test/api_integration/apis/uptime/config.ts
+  - x-pack/test/apm_api_integration/basic/config.ts
+  - x-pack/test/apm_api_integration/cloud/config.ts
+  - x-pack/test/apm_api_integration/rules/config.ts
+  - x-pack/test/apm_api_integration/trial/config.ts
+  - x-pack/test/dataset_quality_api_integration/basic/config.ts
+  - x-pack/test/functional/apps/observability_logs_explorer/config.ts
+  - x-pack/test/functional/apps/dataset_quality/config.ts
+  - x-pack/test/functional/apps/slo/embeddables/config.ts
+  - x-pack/test/functional/apps/uptime/config.ts
+  - x-pack/test/observability_api_integration/basic/config.ts
+  - x-pack/test/observability_api_integration/trial/config.ts
+  - x-pack/test/observability_functional/with_rac_write.config.ts
+  - x-pack/test/observability_onboarding_api_integration/basic/config.ts
+  - x-pack/test/observability_onboarding_api_integration/cloud/config.ts
+  - x-pack/test/observability_ai_assistant_api_integration/enterprise/config.ts
+  - x-pack/test/observability_ai_assistant_functional/enterprise/config.ts
+  - x-pack/test/profiling_api_integration/cloud/config.ts
+  - x-pack/test/functional/apps/apm/config.ts
+