rmcdaniel · Oct 22, 2026
diff --git a/.github/workflows/server-parity.yml b/.github/workflows/server-parity.yml
@@ -36,6 +36,7 @@ on:
       - tests/Unit/ServerParityOperatorMetricsContractTest.mjs
       - tests/Unit/ServerParityActivityLeaseRenewalContractTest.mjs
       - tests/Unit/ServerParityServiceCatalogContractTest.mjs
+      - tests/Unit/ServerParitySystemMetricsContractTest.mjs
       - tests/Unit/ServerParityNamespaceDeleteContractTest.mjs
       - tests/Unit/ServerParityWaitingHistoryContractTest.mjs
       - tests/Unit/ServerParityTaskRetryContractTest.mjs
@@ -86,6 +87,7 @@ on:
       - tests/Unit/ServerParityOperatorMetricsContractTest.mjs
       - tests/Unit/ServerParityActivityLeaseRenewalContractTest.mjs
       - tests/Unit/ServerParityServiceCatalogContractTest.mjs
+      - tests/Unit/ServerParitySystemMetricsContractTest.mjs
       - tests/Unit/ServerParityNamespaceDeleteContractTest.mjs
       - tests/Unit/ServerParityWaitingHistoryContractTest.mjs
       - tests/Unit/ServerParityTaskRetryContractTest.mjs
@@ -1504,7 +1506,7 @@ jobs:
             -e COMPOSER_HOME=/tmp/composer -v "$PWD:/source" -w /source "$image" \
             install --working-dir=scripts/conformance/server-parity --no-interaction --no-progress
           docker run --rm --user=1000:1000 --entrypoint node -v "$PWD:/source:ro" -w /source \
-            "$image" --test tests/Unit/ServerParityRunnerTest.mjs tests/Unit/ServerParityCooperativeContractTest.mjs tests/Unit/ServerParityChildCancellationContractTest.mjs tests/Unit/ServerParityScheduleContractTest.mjs tests/Unit/ServerParityVisibilityContractTest.mjs tests/Unit/ServerParityAdmissionContractTest.mjs tests/Unit/ServerParityRoleTokenContractTest.mjs tests/Unit/ServerParityWorkerDeregistrationContractTest.mjs tests/Unit/ServerParitySearchAttributeContractTest.mjs tests/Unit/ServerParityWorkerListingContractTest.mjs tests/Unit/ServerParityWorkerReplacementContractTest.mjs tests/Unit/ServerParityPatchDeploymentContractTest.mjs tests/Unit/ServerParityWaitingHistoryContractTest.mjs tests/Unit/ServerParityTaskRetryContractTest.mjs tests/Unit/ServerParityPublishedPatchContractTest.mjs tests/Unit/ServerParityPublishedPatchTransportTest.mjs tests/Unit/ServerParityRecordFileTest.mjs tests/Unit/ServerParityLateWorkflowCompletionContractTest.mjs tests/Unit/ServerParityStorageTestContractTest.mjs tests/Unit/ServerParitySchedulePoliciesContractTest.mjs tests/Unit/ServerParitySignalsBeforeWorkerContractTest.mjs tests/Unit/ServerParityScheduleCatalogContractTest.mjs tests/Unit/ServerParityOperatorMetricsContractTest.mjs tests/Unit/ServerParityActivityLeaseRenewalContractTest.mjs tests/Unit/ServerParityServiceCatalogContractTest.mjs tests/Unit/ServerParityNamespaceDeleteContractTest.mjs > parity-evidence/comparator-tests.txt
+            "$image" --test tests/Unit/ServerParityRunnerTest.mjs tests/Unit/ServerParityCooperativeContractTest.mjs tests/Unit/ServerParityChildCancellationContractTest.mjs tests/Unit/ServerParityScheduleContractTest.mjs tests/Unit/ServerParityVisibilityContractTest.mjs tests/Unit/ServerParityAdmissionContractTest.mjs tests/Unit/ServerParityRoleTokenContractTest.mjs tests/Unit/ServerParityWorkerDeregistrationContractTest.mjs tests/Unit/ServerParitySearchAttributeContractTest.mjs tests/Unit/ServerParityWorkerListingContractTest.mjs tests/Unit/ServerParityWorkerReplacementContractTest.mjs tests/Unit/ServerParityPatchDeploymentContractTest.mjs tests/Unit/ServerParityWaitingHistoryContractTest.mjs tests/Unit/ServerParityTaskRetryContractTest.mjs tests/Unit/ServerParityPublishedPatchContractTest.mjs tests/Unit/ServerParityPublishedPatchTransportTest.mjs tests/Unit/ServerParityRecordFileTest.mjs tests/Unit/ServerParityLateWorkflowCompletionContractTest.mjs tests/Unit/ServerParityStorageTestContractTest.mjs tests/Unit/ServerParitySchedulePoliciesContractTest.mjs tests/Unit/ServerParitySignalsBeforeWorkerContractTest.mjs tests/Unit/ServerParityScheduleCatalogContractTest.mjs tests/Unit/ServerParityOperatorMetricsContractTest.mjs tests/Unit/ServerParityActivityLeaseRenewalContractTest.mjs tests/Unit/ServerParityServiceCatalogContractTest.mjs tests/Unit/ServerParitySystemMetricsContractTest.mjs tests/Unit/ServerParityNamespaceDeleteContractTest.mjs > parity-evidence/comparator-tests.txt
           docker run --rm --user=1000:1000 --cpus=1 --memory=256m --memory-swap=256m \
             --network=none --entrypoint node -v "$PWD:/source:ro" -w /source \
             "$image" --test tests/Unit/ServerParityCodecDeadlineLoadTest.mjs > parity-evidence/codec-load-tests.txt

diff --git a/docs/rust-server-port.md b/docs/rust-server-port.md
@@ -101,10 +101,15 @@ Updated October 22, 2026.
 These published PHP routes on this tree have no native handler yet, by family.
 
 - **Used by the CLI or Waterline.**
-  - Namespace delete.
   - Standalone activities: list, describe and start.
-  - `system` metrics (JSON and Prometheus), the repair pass, and external
-    payload cleanup and its pass.
+  - The Prometheus metrics summary, the repair pass, and external payload
+    cleanup and its pass. (Namespace delete is served with the
+    `namespace-delete` fixture. The JSON `GET|POST /api/system/metrics` is
+    served with the `system-metrics` fixture: namespace failure, durable-state
+    and payload counts are exact; native enforces no admission, durable-state
+    or payload quota, so limits are null and rejections zero, as on an
+    unconfigured PHP server. Projection drift is server-wide, and native's
+    only drift source is a run without its summary.)
   - Task queue priority and fairness.
 - **Worker protocol features.**
   - Worker sessions.

diff --git a/rust/src/runtime/execution.rs b/rust/src/runtime/execution.rs
@@ -339,6 +339,7 @@ impl Runtime {
     delegate!(system_health(config: &super::operator_metrics::MetricsConfig) -> Result<(bool, Value)>);
     delegate!(operator_dashboard(config: &super::operator_metrics::MetricsConfig, bounded: bool) -> Result<Value>);
     delegate!(repair_status() -> Result<Value>);
+    delegate!(system_metrics() -> Result<Value>);
     delegate!(retention_status(limit: i64) -> Result<Value>);
     delegate!(retention_pass(limit: i64, run_ids: Vec<String>) -> Result<(Value, bool)>);
     delegate!(activity_timeout_status(limit: i64) -> Result<Value>);

diff --git a/rust/src/runtime/http.rs b/rust/src/runtime/http.rs
@@ -203,6 +203,7 @@ pub fn router(runtime: Runtime) -> Router {
         )
         .route("/api/system/operator-metrics", get(operator_metrics))
         .route("/api/system/health", get(system_health))
+        .route("/api/system/metrics", get(system_metrics).post(system_metrics))
         .route("/api/system/operator-dashboard", get(operator_dashboard))
         .route("/api/system/operator-dashboard/bounded", get(bounded_operator_dashboard))
         .route(
@@ -645,6 +646,10 @@ fn named_namespace_operation(method: &str, path: &str) -> bool {
     if path == "/api/system/retention/pass" || path == "/api/system/activity-timeouts/pass" {
         return method == "POST";
     }
+    // The metrics describe the namespace's own state, read by GET or POST.
+    if path == "/api/system/metrics" {
+        return matches!(method, "GET" | "POST");
+    }
     if let Some(path) = path.strip_prefix("/api/workflows/") {
         let parts: Vec<_> = path.split('/').collect();
         if matches!(
@@ -704,7 +709,7 @@ fn named_namespace_operation(method: &str, path: &str) -> bool {
                 | ["workflow-tasks" | "activity-tasks", "poll"]
                 | ["query-tasks", "poll"]
                 | ["query-tasks", _, "complete" | "fail" | "status"]
-                | ["workflow-tasks", _, "complete" | "history" | "heartbeat"]
+                | ["workflow-tasks", _, "complete" | "fail" | "history" | "heartbeat"]
                 | [
                     "activity-tasks",
                     _,
@@ -1473,6 +1478,10 @@ async fn activity_timeout_status(
     Ok(Json(runtime.activity_timeout_status(limit).await?))
 }
 
+async fn system_metrics(Extension(runtime): Extension<Runtime>) -> Result<Json<Value>> {
+    Ok(Json(runtime.system_metrics().await?))
+}
+
 /// PHP answers 503 while a check reports an error.
 async fn system_health(Extension(runtime): Extension<Runtime>) -> Result<Response> {
     let (unavailable, body) = runtime.system_health(&metrics_config(&runtime)).await?;

diff --git a/rust/src/runtime/mod.rs b/rust/src/runtime/mod.rs
@@ -108,6 +108,7 @@ mod start_definition;
 mod start_request;
 mod storage_test;
 mod store;
+mod system_metrics;
 mod system_health;
 mod task_failures;
 mod task_repair;

diff --git a/rust/src/runtime/store.rs b/rust/src/runtime/store.rs
@@ -1848,12 +1848,8 @@ where
         // replay block, without a retry, until an operator repairs the run.
         let range_blocked =
             range_blocked || (!waiting && super::task_failures::blocks_replay(&body["failure"]));
-        if !waiting && self.namespace.as_ref() != "default" {
-            return Err(refuse(
-                StatusCode::UNPROCESSABLE_ENTITY,
-                "development_workflow_task_retry_namespace_unqualified",
-            ));
-        }
+        // The task is read within the request's namespace, and its retry
+        // copies the run's namespace.
         let mut tx = self.begin().await?;
         let task = self.task_row(&mut tx, task_id).await?;
         if DB::string(&task, "task_type")? != "workflow" {