diff --git a/packages/cli/src/commands/render.ts b/packages/cli/src/commands/render.ts
index b14f1a01d8..504eab24c9 100644
--- a/packages/cli/src/commands/render.ts
+++ b/packages/cli/src/commands/render.ts
@@ -1017,6 +1017,38 @@ function getMemorySnapshot() {
   };
 }
 
+/**
+ * Sizing + memory props for the failure path.
+ *
+ * `job.perfSummary` — where the success path reads these from — is assembled
+ * only after a render completes, so these come off the job fields the
+ * orchestrator's unconditional memory-sampler disposer writes
+ * (`recordJobFailureMetrics`). Extracted from `handleRenderError` to keep its
+ * branch count down.
+ *
+ * Prefers the sampled running peak to the teardown RSS snapshot: the snapshot
+ * reads whatever RSS happens to be at teardown and misses the mid-render spike
+ * the field exists to catch.
+ */
+function failureSizingTelemetry(job: RenderJob | undefined, requestedWorkers: number | undefined) {
+  const snapshot = getMemorySnapshot();
+  const base = {
+    ...snapshot,
+    peakMemoryMb: job?.peakRssMb ?? snapshot.peakMemoryMb,
+    peakHeapUsedMb: job?.peakHeapUsedMb,
+  };
+  const sizing = job?.workerSizing;
+  if (!sizing) return { ...base, workers: requestedWorkers };
+  return {
+    ...base,
+    workers: requestedWorkers ?? sizing.workers,
+    workersBoundBy: sizing.boundBy,
+    workersHeapBased: sizing.heapBasedWorkers,
+    workersHeapLimitMb: sizing.heapLimitMb,
+    workersExceedHeapAdvisory: sizing.exceedsHeapAdvisory,
+  };
+}
+
 function metaString(meta: Record<string, unknown> | undefined, key: string): string | undefined {
   const value = meta?.[key];
   return typeof value === "string" ? value : undefined;
@@ -1439,14 +1471,13 @@ function handleRenderError(
     fps: fpsToNumber(options.fps),
     quality: options.quality,
     docker,
-    workers: options.workers,
     gpu: options.gpu,
     authoringSkill: options.authoringSkill,
     elapsedMs: Date.now() - startTime,
     errorMessage: message,
     failedStage,
     ...renderJobObservabilityTelemetryPayload(job),
-    ...getMemorySnapshot(),
+    ...failureSizingTelemetry(job, options.workers),
   });
   // Failed renders join the recent-renders ring too — a bug report filed via
   // `hyperframes feedback` is MOST likely to be about a failed render.
@@ -1599,6 +1630,10 @@ function trackRenderMetrics(
     extractCacheMisses: extract?.cacheMisses,
     ...renderJobObservabilityTelemetryPayload(job),
     ...getMemorySnapshot(),
+    // Same reason as the failure path: prefer the sampled running peak to the
+    // teardown snapshot. Falls back when perfSummary is absent (e.g. Docker).
+    peakMemoryMb: perf?.peakRssMb ?? getMemorySnapshot().peakMemoryMb,
+    peakHeapUsedMb: perf?.peakHeapUsedMb,
   });
 }
 
diff --git a/packages/cli/src/telemetry/events.test.ts b/packages/cli/src/telemetry/events.test.ts
index f7aa33ae34..68a3871bf0 100644
--- a/packages/cli/src/telemetry/events.test.ts
+++ b/packages/cli/src/telemetry/events.test.ts
@@ -355,6 +355,38 @@ describe("render telemetry events", () => {
     );
   });
 
+  // PRINFRA-341 could not be decided because these props were render_complete
+  // only: 0 of 317k render_error events carried them, so advisory-true renders
+  // could never be correlated with failures. Dropping them again re-opens that.
+  it("carries worker-sizing provenance and sampled peaks on render_error too", () => {
+    trackRenderError({
+      fps: 30,
+      quality: "high",
+      docker: false,
+      workers: 6,
+      workersBoundBy: "heap",
+      workersHeapBased: 4,
+      workersHeapLimitMb: 4144,
+      workersExceedHeapAdvisory: true,
+      peakMemoryMb: 1633,
+      peakHeapUsedMb: 900,
+    });
+
+    expect(trackEvent).toHaveBeenCalledWith(
+      "render_error",
+      expect.objectContaining({
+        workers: 6,
+        workers_bound_by: "heap",
+        workers_heap_based: 4,
+        workers_heap_limit_mb: 4144,
+        workers_exceed_heap_advisory: true,
+        peak_memory_mb: 1633,
+        peak_heap_used_mb: 900,
+      }),
+      undefined,
+    );
+  });
+
   it("ties feedback to its report and recent renders via feedback_id + recent_render_ids", () => {
     trackRenderFeedback({
       rating: 3,
@@ -864,3 +896,40 @@ describe("power-state sampling respects the telemetry opt-out", () => {
     expect(getPowerState).not.toHaveBeenCalled();
   });
 });
+
+// Appended at end of file deliberately: inserting mid-file shifts the line
+// numbers of pre-existing clone groups, which makes fallow re-report them as
+// new findings on an unrelated change.
+describe("render_error worker-sizing provenance", () => {
+  // PRINFRA-341 could not be decided because these props were render_complete
+  // only: 0 of 317k render_error events carried them, so advisory-true renders
+  // could never be correlated with failures. Dropping them reopens that.
+  it("carries sizing and sampled peaks on the failure path", () => {
+    trackRenderError({
+      fps: 30,
+      quality: "high",
+      docker: false,
+      workers: 6,
+      workersBoundBy: "heap",
+      workersHeapBased: 4,
+      workersHeapLimitMb: 4144,
+      workersExceedHeapAdvisory: true,
+      peakMemoryMb: 1633,
+      peakHeapUsedMb: 900,
+    });
+    const props = trackEvent.mock.calls.at(-1)?.[1] as Record<string, unknown>;
+    expect(props.workers_bound_by).toBe("heap");
+    expect(props.workers_heap_based).toBe(4);
+    expect(props.workers_heap_limit_mb).toBe(4144);
+    expect(props.workers_exceed_heap_advisory).toBe(true);
+    expect(props.peak_memory_mb).toBe(1633);
+    expect(props.peak_heap_used_mb).toBe(900);
+  });
+
+  it("omits them when the render failed before sizing was computed", () => {
+    trackRenderError({ fps: 30, quality: "draft", docker: false });
+    const props = trackEvent.mock.calls.at(-1)?.[1] as Record<string, unknown>;
+    expect(props.workers_bound_by).toBeUndefined();
+    expect(props.workers_heap_limit_mb).toBeUndefined();
+  });
+});
diff --git a/packages/cli/src/telemetry/events.ts b/packages/cli/src/telemetry/events.ts
index 838b1cfc30..53337cf29e 100644
--- a/packages/cli/src/telemetry/events.ts
+++ b/packages/cli/src/telemetry/events.ts
@@ -316,6 +316,8 @@ export function trackRenderComplete(
     capturePeakMs?: number;
     // Resource usage
     peakMemoryMb?: number;
+    /** Sampled running peak of V8 heapUsed (complement to RSS). */
+    peakHeapUsedMb?: number;
     memoryFreeMb?: number;
     tmpPeakBytes?: number;
     // Per-stage timings (subset of RenderPerfSummary.stages)
@@ -413,6 +415,7 @@ export function trackRenderComplete(
       video_count: props.videoCount,
       capture_peak_ms: props.capturePeakMs,
       peak_memory_mb: props.peakMemoryMb,
+      peak_heap_used_mb: props.peakHeapUsedMb,
       memory_free_mb: props.memoryFreeMb,
       tmp_peak_bytes: props.tmpPeakBytes,
       stage_compile_ms: props.stageCompileMs,
@@ -460,7 +463,18 @@ export function trackRenderError(
     errorMessage?: string;
     elapsedMs?: number;
     peakMemoryMb?: number;
+    peakHeapUsedMb?: number;
     memoryFreeMb?: number;
+    /**
+     * Worker sizing on the failure path. Previously `render_complete`-only,
+     * which left PRINFRA-341's central question unanswerable: 0 of 317k
+     * `render_error` events carried these, so advisory-true renders could
+     * never be correlated with failures.
+     */
+    workersBoundBy?: string;
+    workersHeapBased?: number;
+    workersHeapLimitMb?: number;
+    workersExceedHeapAdvisory?: boolean;
     // Attribute this event to a specific user (e.g. the browser user who
     // triggered a studio render); defaults to the install anonymousId.
     distinctId?: string;
@@ -480,7 +494,12 @@ export function trackRenderError(
       error_message: props.errorMessage ? redactTelemetryMessage(props.errorMessage) : undefined,
       elapsed_ms: props.elapsedMs,
       peak_memory_mb: props.peakMemoryMb,
+      peak_heap_used_mb: props.peakHeapUsedMb,
       memory_free_mb: props.memoryFreeMb,
+      workers_bound_by: props.workersBoundBy,
+      workers_heap_based: props.workersHeapBased,
+      workers_heap_limit_mb: props.workersHeapLimitMb,
+      workers_exceed_heap_advisory: props.workersExceedHeapAdvisory,
       ...powerStateFields(),
       // gpu_renderer arrives via renderObservabilityEventProperties below:
       // on the failure path perfSummary is never built, so live capture
diff --git a/packages/producer/src/services/render/shared.test.ts b/packages/producer/src/services/render/shared.test.ts
index 04e47bc90d..fd99404506 100644
--- a/packages/producer/src/services/render/shared.test.ts
+++ b/packages/producer/src/services/render/shared.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, it } from "bun:test";
-import { resolveBrowserMediaEnd } from "./shared.js";
+import { recordJobFailureMetrics, resolveBrowserMediaEnd } from "./shared.js";
 
 describe("resolveBrowserMediaEnd", () => {
   it("prefers a runtime duration over a stale compiler-clamped end", () => {
@@ -15,3 +15,39 @@ describe("resolveBrowserMediaEnd", () => {
     expect(resolveBrowserMediaEnd(0, 5.04, 0)).toBe(5.04);
   });
 });
+
+describe("recordJobFailureMetrics", () => {
+  const sampler = {
+    peakRssBytes: () => 300 * 1024 * 1024,
+    peakHeapUsedBytes: () => 120 * 1024 * 1024,
+  };
+
+  // The whole point: perfSummary is success-only, so a thrown render must
+  // still leave sizing + peaks on the job for render_error to read.
+  it("copies sampled peaks and sizing onto the job", () => {
+    const job: { peakRssMb?: number; peakHeapUsedMb?: number; workerSizing?: { workers: number } } =
+      {};
+    recordJobFailureMetrics(job, sampler, { workers: 6 });
+    expect(job.peakRssMb).toBe(300);
+    expect(job.peakHeapUsedMb).toBe(120);
+    expect(job.workerSizing).toEqual({ workers: 6 });
+  });
+
+  it("records peaks even when sizing was never computed (failure before capture)", () => {
+    const job: { peakRssMb?: number; peakHeapUsedMb?: number; workerSizing?: { workers: number } } =
+      {};
+    recordJobFailureMetrics(job, sampler, undefined);
+    expect(job.peakRssMb).toBe(300);
+    expect(job.workerSizing).toBeUndefined();
+  });
+
+  it("keeps an already-recorded sizing rather than blanking it", () => {
+    const job: { peakRssMb?: number; peakHeapUsedMb?: number; workerSizing?: { workers: number } } =
+      {
+        workerSizing: { workers: 4 },
+      };
+    recordJobFailureMetrics(job, null, undefined);
+    expect(job.workerSizing).toEqual({ workers: 4 });
+    expect(job.peakRssMb).toBeUndefined();
+  });
+});
diff --git a/packages/producer/src/services/render/shared.ts b/packages/producer/src/services/render/shared.ts
index 15eaf8226f..abeac251b2 100644
--- a/packages/producer/src/services/render/shared.ts
+++ b/packages/producer/src/services/render/shared.ts
@@ -364,6 +364,38 @@ export interface MemorySampler {
   stop: () => void;
 }
 
+/**
+ * Copy sizing + sampled peak memory onto the job so they survive a failed
+ * render.
+ *
+ * `job.perfSummary` is assembled only after a render succeeds, so a throw
+ * mid-capture previously reached `render_error` with no sizing or memory
+ * context — 0 of 317k fleet failures carried `workers_heap_*`, which is why
+ * PRINFRA-341's "do advisory-true renders OOM?" question was unanswerable.
+ * Called from the unconditional memory-sampler disposer, so it runs on both
+ * the success and failure paths.
+ *
+ * ponytail: structurally typed rather than importing RenderJob/WorkerSizing —
+ * renderOrchestrator already imports this module, so a nominal import here
+ * would be a cycle.
+ *
+ * Does NOT make fatal V8 OOMs observable: `FATAL ERROR: Reached heap limit`
+ * aborts the process before any event is sent. This covers failures that
+ * reach an error handler at all.
+ */
+export function recordJobFailureMetrics<TSizing>(
+  job: { peakRssMb?: number; peakHeapUsedMb?: number; workerSizing?: TSizing },
+  sampler: Pick<MemorySampler, "peakRssBytes" | "peakHeapUsedBytes"> | null,
+  sizing: TSizing | undefined,
+): void {
+  if (sampler) {
+    job.peakRssMb = Math.round(sampler.peakRssBytes() / (1024 * 1024));
+    job.peakHeapUsedMb = Math.round(sampler.peakHeapUsedBytes() / (1024 * 1024));
+  }
+  // Leave a previously-recorded sizing in place rather than blanking it.
+  if (sizing !== undefined) job.workerSizing = sizing;
+}
+
 export function createMemorySampler(intervalMs: number = 250): MemorySampler {
   let peakRss = 0;
   let peakHeap = 0;
diff --git a/packages/producer/src/services/renderOrchestrator.ts b/packages/producer/src/services/renderOrchestrator.ts
index ad4abc2d35..47c652e206 100644
--- a/packages/producer/src/services/renderOrchestrator.ts
+++ b/packages/producer/src/services/renderOrchestrator.ts
@@ -110,7 +110,12 @@ import {
   outputSupportsPageSideShaderCompositing,
   type RenderOutputFormat,
 } from "./render/renderFormat.js";
-import { createMemorySampler, type MemorySampler, updateJobStatus } from "./render/shared.js";
+import {
+  createMemorySampler,
+  type MemorySampler,
+  recordJobFailureMetrics,
+  updateJobStatus,
+} from "./render/shared.js";
 import { buildRenderErrorDetails } from "./render/cleanup.js";
 import { publishRenderFailure } from "./render/renderEventPublisher.js";
 import { EncoderInterruptedError } from "./render/encoderInterruption.js";
@@ -625,6 +630,22 @@ export interface RenderJob {
   totalFrames?: number;
   framesRendered?: number;
   perfSummary?: RenderPerfSummary;
+  /**
+   * Worker sizing + peak memory, recorded as soon as they are known rather
+   * than assembled at the end like {@link perfSummary}.
+   *
+   * `perfSummary` is only assigned on the success path, so a render that dies
+   * mid-capture carried no sizing or memory context into `render_error` — the
+   * gap that made PRINFRA-341's "do advisory-true renders OOM?" question
+   * unanswerable across 317k fleet failures. These are written by the
+   * unconditional memory-sampler disposer, so they survive a throw.
+   *
+   * NOT a fix for fatal V8 OOMs: `FATAL ERROR: Reached heap limit` aborts the
+   * process, so no telemetry is sent at all. This covers recoverable failures.
+   */
+  workerSizing?: WorkerSizing;
+  peakRssMb?: number;
+  peakHeapUsedMb?: number;
   failedStage?: string;
   errorDetails?: {
     message: string;
@@ -2250,6 +2271,9 @@ async function executeRenderPipeline(input: {
     await closeCaptureSession(session);
   });
   execution.defer("stop memory sampler", () => {
+    // Runs on every exit including a throw, unlike the perfSummary assembly
+    // at the end of the happy path — see recordJobFailureMetrics.
+    recordJobFailureMetrics(job, memSampler, workerSizing);
     memSampler?.stop();
     memSampler = null;
   });