diff --git a/extensions/adobe/experience/customerJourneyManagement/custom-channel-execution-metrics.example.1.json b/extensions/adobe/experience/customerJourneyManagement/custom-channel-execution-metrics.example.1.json
new file mode 100644
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+++ b/extensions/adobe/experience/customerJourneyManagement/custom-channel-execution-metrics.example.1.json
@@ -0,0 +1,8 @@
+{
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/endpoint": "https://api.viber.com/v1/send",
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/method": "POST",
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/requestTimestamp": "2026-05-20T14:35:22.264Z",
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/responseTime": 187,
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/statusCode": 200,
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/throttleApplicable": false
+}
diff --git a/extensions/adobe/experience/customerJourneyManagement/custom-channel-execution-metrics.example.2.json b/extensions/adobe/experience/customerJourneyManagement/custom-channel-execution-metrics.example.2.json
new file mode 100644
index 000000000..d06b1c5fd
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+++ b/extensions/adobe/experience/customerJourneyManagement/custom-channel-execution-metrics.example.2.json
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+{
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/endpoint": "https://api.viber.com/v1/send",
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/method": "POST",
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/requestTimestamp": "2026-05-20T14:36:06.450Z",
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/responseTime": 2462,
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/statusCode": 503,
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/throttleApplicable": false,
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/errorCode": "HTTP_5XX",
+  "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/errorReason": "503 Service Unavailable after 3 retries"
+}
diff --git a/extensions/adobe/experience/customerJourneyManagement/custom-channel-execution-metrics.schema.json b/extensions/adobe/experience/customerJourneyManagement/custom-channel-execution-metrics.schema.json
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+++ b/extensions/adobe/experience/customerJourneyManagement/custom-channel-execution-metrics.schema.json
@@ -0,0 +1,74 @@
+{
+  "meta:license": [
+    "Copyright 2026 Adobe Systems Incorporated. All rights reserved.",
+    "This work is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) license",
+    "you may not use this file except in compliance with the License. You may obtain a copy",
+    "of the License at https://creativecommons.org/licenses/by/4.0/"
+  ],
+  "$id": "https://ns.adobe.com/experience/customerJourneyManagement/custom-channel-execution-metrics",
+  "$schema": "http://json-schema.org/draft-06/schema#",
+  "title": "Adobe CJM ExperienceEvent - Custom Channel Execution Metrics",
+  "description": "Per-call execution metrics for custom-channel deliveries. Populated only by MSW for custom-channel sends. Email/SMS/Push/Line paths leave this block absent. Validity-expired events also leave this block absent (handled via messageDeliveryfeedback.messageExclusion). See wiki 3886615741 for design rationale.",
+  "type": "object",
+  "meta:extensible": true,
+  "meta:abstract": true,
+  "meta:intendedToExtend": ["https://ns.adobe.com/xdm/context/experienceevent"],
+
+  "definitions": {
+    "customChannelExecutionMetrics": {
+      "properties": {
+        "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/endpoint": {
+          "title": "Endpoint",
+          "type": "string",
+          "description": "URL template of the custom-channel customer endpoint, with placeholders un-substituted (e.g. `https://api.viber.com/v1/{{profile.id}}/send`). Stored as the template form — NOT the runtime-interpolated URL — to prevent per-user / per-record cardinality explosion in live reporting (confirmed with reporting team 2026-05-22; precedent is AJO's existing email `domain` derived field that truncates the link URL). Query parameters are stripped before storage. Live reporting derives a coarser `endpointHost` tag from this for Cortex tagging; all-time CJA can use the full template for endpoint-level drilldown. Null when the call was skipped before HTTP was attempted (errorCode set to AUTH_* / REQUEST_GENERATION_ERROR)."
+        },
+        "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/method": {
+          "title": "HTTP Method",
+          "type": "string",
+          "description": "HTTP method used for the call (POST, GET, PUT, etc.). Null when the call was skipped."
+        },
+        "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/requestTimestamp": {
+          "title": "Request Timestamp",
+          "type": "string",
+          "format": "date-time",
+          "description": "Wall-clock timestamp (UTC) captured immediately before the customer-endpoint HTTP request is sent on the wire. Null when the call was skipped."
+        },
+        "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/responseTime": {
+          "title": "Response Time",
+          "type": "integer",
+          "description": "Server HTTP response time in milliseconds. Measured around the customer-endpoint HTTP exchange only - excludes auth latency, connection acquisition, throttle wait (see waitTime), and pool wait. Matches Custom Action XDM actionExecutionOriginTime semantics. For HTTP_TIMEOUT: equals the configured timeout duration. Null when the call was skipped."
+        },
+        "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/waitTime": {
+          "title": "Wait Time",
+          "type": "integer",
+          "description": "Time in milliseconds the call waited in the throttle queue before the HTTP exchange started. Phase 2: populated when per-call throttle wait instrumentation lands. Phase 1: null/absent (not yet populated by MSW). When populated, total wall-clock latency = waitTime + responseTime + auth/cache overhead."
+        },
+        "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/statusCode": {
+          "title": "Status Code",
+          "type": "integer",
+          "description": "HTTP response status code from the customer endpoint, preserved as the raw integer (e.g. 401, 503) for finer-grained drilldown and manual debugging. The HTTP_4XX / HTTP_5XX classification in errorCode is a producer-side convenience for bucket gating; consumers SHOULD use statusCode for exact-code analysis. Null when the call was skipped (no HTTP attempt) or timed out without a response."
+        },
+        "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/throttleApplicable": {
+          "title": "Throttle Applicable",
+          "type": "boolean",
+          "description": "Config-level flag: whether throttling configuration is applied to this endpoint/channel at the time of dispatch. Mirrors the cacheApplicable pattern (config-level vs runtime-level). Does NOT indicate this specific call actually waited in a queue - that signal would require per-call instrumentation (Phase 2; reserved for a separate runtime field). Matches Custom Action XDM actionIsThrottled literal meaning."
+        },
+        "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/errorCode": {
+          "title": "Error Code",
+          "type": "string",
+          "description": "Unified error envelope covering both skip-stage (auth/cache) and HTTP-stage (4xx/5xx/timeout) failures. Null on success. Producers SHOULD use the controlled vocabulary documented in wiki 3886615741 section 7 - example values: AUTH_CACHE_IO, AUTH_HTTP_ERROR, AUTH_TOKEN_PARSE, AUTH_TOKEN_EXPIRED, REQUEST_GENERATION_ERROR, HTTP_4XX, HTTP_5XX, HTTP_TIMEOUT, HTTP_PARSE_ERROR. Schema does NOT enum-constrain the value so producer code can evolve the vocabulary without an XDM schema update."
+        },
+        "https://ns.adobe.com/experience/customerJourneyManagement/customChannelExecutionMetrics/errorReason": {
+          "title": "Error Reason",
+          "type": "string",
+          "description": "Human-readable detail of the failure (exception message, parsed error body, etc.). Used for drilldown tooltips and debugging. Not intended for aggregation - use errorCode for grouping. Null on success."
+        }
+      }
+    }
+  },
+  "allOf": [
+    { "$ref": "https://ns.adobe.com/xdm/common/extensible#/definitions/@context" },
+    { "$ref": "#/definitions/customChannelExecutionMetrics" }
+  ],
+  "meta:status": "experimental"
+}