From 60efb246e8cbfaa172e7a722f98a9377004e996e Mon Sep 17 00:00:00 2001
From: Caue Marcondes <caue.marcondes@elastic.co>
Date: Wed, 18 Jun 2025 13:07:16 -0400
Subject: [PATCH] [APM] integration new tail sampling settings

---
 .../observability/plugins/apm/common/fleet.ts |  2 +
 .../tail_sampling_settings.tsx                | 46 +++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/x-pack/solutions/observability/plugins/apm/common/fleet.ts b/x-pack/solutions/observability/plugins/apm/common/fleet.ts
index 5f64255c7ad54..0e66e4e111623 100644
--- a/x-pack/solutions/observability/plugins/apm/common/fleet.ts
+++ b/x-pack/solutions/observability/plugins/apm/common/fleet.ts
@@ -47,6 +47,8 @@ export const INPUT_VAR_NAME_TO_SCHEMA_PATH: Record<string, string> = {
   tail_sampling_enabled: 'apm-server.sampling.tail.enabled',
   tail_sampling_interval: 'apm-server.sampling.tail.interval',
   tail_sampling_policies: 'apm-server.sampling.tail.policies',
+  tail_sampling_ttl: 'apm-server.sampling.tail.ttl',
+  tail_sampling_discard_on_write_failure: 'apm-server.sampling.tail.discard_on_write_failure',
 };
 
 export const LEGACY_TO_CURRENT_SCHEMA_PATHS: Record<string, string> = {
diff --git a/x-pack/solutions/observability/plugins/apm/public/components/fleet_integration/apm_policy_form/settings_definition/tail_sampling_settings.tsx b/x-pack/solutions/observability/plugins/apm/public/components/fleet_integration/apm_policy_form/settings_definition/tail_sampling_settings.tsx
index f2c50133d8969..cf65d19ded278 100644
--- a/x-pack/solutions/observability/plugins/apm/public/components/fleet_integration/apm_policy_form/settings_definition/tail_sampling_settings.tsx
+++ b/x-pack/solutions/observability/plugins/apm/public/components/fleet_integration/apm_policy_form/settings_definition/tail_sampling_settings.tsx
@@ -119,6 +119,52 @@ export function getTailSamplingSettings(docsLinks?: string): SettingsRow[] {
           required: false,
           validation: getStorageSizeRt({ min: '0GB' }),
         },
+        {
+          key: 'tail_sampling_ttl',
+          type: 'duration',
+          label: i18n.translate(
+            'xpack.apm.fleet_integration.settings.tailSampling.tailSamplingTTL',
+            {
+              defaultMessage: 'Tail sampling TTL (Time-to-live)',
+            }
+          ),
+          rowTitle: i18n.translate(
+            'xpack.apm.fleet_integration.settings.tailSampling.tailSamplingTTLTitle',
+            { defaultMessage: 'TTL (Time-to-live)' }
+          ),
+          rowDescription: i18n.translate(
+            'xpack.apm.fleet_integration.settings.tailSampling.tailSamplingTTLDescription',
+            {
+              defaultMessage:
+                'Time-to-live (TTL) for trace events stored in the local storage of the APM Server during tail-based sampling. This TTL determines how long trace events are retained in the local storage while waiting for a sampling decision to be made. A greater TTL value increases storage space requirements. Should be at least 2 * Interval.',
+            }
+          ),
+          labelAppend: OPTIONAL_LABEL,
+          required: false,
+          validation: getDurationRt({ min: '1s' }),
+        },
+        {
+          key: 'tail_sampling_discard_on_write_failure',
+          type: 'boolean',
+          label: i18n.translate(
+            'xpack.apm.fleet_integration.settings.tailSampling.tailSamplingDiscardOnWriteFailure',
+            {
+              defaultMessage: 'Tail sampling discard on write failure',
+            }
+          ),
+          rowTitle: i18n.translate(
+            'xpack.apm.fleet_integration.settings.tailSampling.tailSamplingDiscardOnWriteFailureTitle',
+            { defaultMessage: 'Discard on write failure' }
+          ),
+          rowDescription: i18n.translate(
+            'xpack.apm.fleet_integration.settings.tailSampling.tailSamplingDiscardOnWriteFailureDescription',
+            {
+              defaultMessage:
+                'Defines the indexing behavior when trace events fail to be written to storage (for example, when the storage limit is reached). When set to `false`, traces bypass sampling and are always indexed, which significantly increases the indexing load. When set to `true`, traces are discarded, causing data loss which can result in broken traces.',
+            }
+          ),
+          required: false,
+        },
       ],
     },
   ];