diff --git a/tests/EventsTest.cpp b/tests/EventsTest.cpp
index bb86fe71..18128cc0 100644
--- a/tests/EventsTest.cpp
+++ b/tests/EventsTest.cpp
@@ -15,7 +15,6 @@
 #include <memory>
 #include <vector>
 #include <yoga/YGEnums.h>
-#include <yoga/YGMarker.h>
 
 namespace facebook {
 namespace yoga {
@@ -27,7 +26,7 @@ struct TypedEventTestData {};
 template <>
 struct TypedEventTestData<Event::LayoutPassEnd> {
   void* layoutContext;
-  YGMarkerLayoutData layoutData;
+  LayoutData layoutData;
 };
 
 struct EventArgs {
@@ -147,7 +146,7 @@ TEST_F(EventTest, layout_events_single_node) {
   ASSERT_EQ(events[3].node, root);
   ASSERT_EQ(events[3].type, Event::LayoutPassEnd);
 
-  YGMarkerLayoutData layoutData =
+  LayoutData layoutData =
       events[3].eventTestData<Event::LayoutPassEnd>().layoutData;
 
   ASSERT_EQ(layoutData.layouts, 1);
@@ -170,7 +169,7 @@ TEST_F(EventTest, layout_events_counts_multi_node_layout) {
   ASSERT_EQ(events[11].node, root);
   ASSERT_EQ(events[11].type, Event::LayoutPassEnd);
 
-  YGMarkerLayoutData layoutData =
+  LayoutData layoutData =
       events[11].eventTestData<Event::LayoutPassEnd>().layoutData;
 
   ASSERT_EQ(layoutData.layouts, 3);
@@ -191,7 +190,7 @@ TEST_F(EventTest, layout_events_counts_cache_hits_single_node_layout) {
   ASSERT_EQ(events[6].node, root);
   ASSERT_EQ(events[6].type, Event::LayoutPassEnd);
 
-  YGMarkerLayoutData layoutData =
+  LayoutData layoutData =
       events[6].eventTestData<Event::LayoutPassEnd>().layoutData;
 
   ASSERT_EQ(layoutData.layouts, 0);
@@ -215,7 +214,7 @@ TEST_F(EventTest, layout_events_counts_cache_hits_multi_node_layout) {
   ASSERT_EQ(lastEvent().node, root);
   ASSERT_EQ(lastEvent().type, Event::LayoutPassEnd);
 
-  YGMarkerLayoutData layoutData =
+  LayoutData layoutData =
       lastEvent().eventTestData<Event::LayoutPassEnd>().layoutData;
 
   ASSERT_EQ(layoutData.layouts, 3);
@@ -240,7 +239,7 @@ TEST_F(EventTest, layout_events_has_max_measure_cache) {
   ASSERT_EQ(lastEvent().node, root);
   ASSERT_EQ(lastEvent().type, Event::LayoutPassEnd);
 
-  YGMarkerLayoutData layoutData =
+  LayoutData layoutData =
       lastEvent().eventTestData<Event::LayoutPassEnd>().layoutData;
 
   ASSERT_EQ(layoutData.layouts, 3);
diff --git a/tests/InstrumentationTest.cpp b/tests/InstrumentationTest.cpp
deleted file mode 100644
index 62902e31..00000000
--- a/tests/InstrumentationTest.cpp
+++ /dev/null
@@ -1,164 +0,0 @@
-/*
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the LICENSE
- * file in the root directory of this source tree.
- */
-#include <gtest/gtest.h>
-#include <yoga/Yoga.h>
-#include <yoga/YGMarker.h>
-#include <yoga/instrumentation.h>
-
-#include <cstring>
-#include <deque>
-#include <exception>
-#include <functional>
-#include <memory>
-#include <string>
-
-bool operator==(const YGMarkerLayoutData&, const YGMarkerLayoutData&);
-void PrintTo(const YGMarkerLayoutData, std::ostream*);
-
-namespace facebook {
-namespace yoga {
-namespace marker {
-namespace test {
-
-template <typename T>
-using uniquePtr = std::unique_ptr<T, std::function<void(T*)>>;
-
-struct MarkerTest : public ::testing::Test {
-  struct Data {
-    YGMarker marker;
-    YGNodeRef node;
-    YGMarkerData markerData;
-  };
-
-  struct EndData {
-    Data data;
-    void* cookie;
-    union {
-      YGMarkerLayoutData layout;
-    } markerData;
-  };
-
-  struct MarkerCookie {
-    Data start;
-    EndData end;
-  };
-
-  // std::deque will keep pointers stable on reallocation, whereas std::vector
-  // does not
-  static std::deque<MarkerCookie> markerCookies;
-
-  static void* startMarker(YGMarker, YGNodeRef, YGMarkerData);
-  static void endMarker(YGMarker, YGNodeRef, YGMarkerData, void*);
-  uniquePtr<YGNode> makeNode();
-  uniquePtr<YGNode> addChild(uniquePtr<YGNode>& owner);
-  static void calculateLayout(
-      uniquePtr<YGNode>& node,
-      float width = YGUndefined,
-      float height = YGUndefined);
-  static MarkerCookie& findMarker(YGMarker);
-  static MarkerCookie& findLastMarker(YGMarker);
-
-  void SetUp() override;
-  void TearDown() override;
-  uniquePtr<YGConfig> config;
-};
-
-void* MarkerTest::startMarker(
-    YGMarker marker,
-    YGNodeRef node,
-    YGMarkerData data) {
-  markerCookies.emplace_back();
-  MarkerCookie* cookie = &markerCookies.back();
-  cookie->start = {marker, node, data};
-  return cookie;
-}
-
-void MarkerTest::endMarker(
-    YGMarker marker,
-    YGNodeRef node,
-    YGMarkerData data,
-    void* id) {
-  auto cookie = static_cast<MarkerCookie*>(id);
-  cookie->end = {{marker, node, data}, id, {}};
-}
-
-uniquePtr<YGNode> MarkerTest::makeNode() {
-  auto n = uniquePtr<YGNode>{YGNodeNewWithConfig(config.get()), &YGNodeFree};
-  return n;
-}
-
-uniquePtr<YGNode> MarkerTest::addChild(uniquePtr<YGNode>& owner) {
-  auto n = makeNode();
-  YGNodeInsertChild(owner.get(), n.get(), YGNodeGetChildCount(owner.get()));
-  return n;
-}
-
-void MarkerTest::calculateLayout(
-    uniquePtr<YGNode>& node,
-    float width,
-    float height) {
-  YGNodeCalculateLayout(node.get(), width, height, YGDirectionLTR);
-}
-
-namespace {
-
-const char* markerTypeName(YGMarker type) {
-  return "";
-}
-
-template <typename It>
-MarkerTest::MarkerCookie& find(It begin, It end, YGMarker type) {
-  auto result = std::find_if(begin, end, [type](MarkerTest::MarkerCookie& c) {
-    return c.start.marker == type;
-  });
-  if (result == end) {
-    throw std::runtime_error{std::string{"No marker recorded for type: "} +
-                             markerTypeName(type)};
-  }
-  return *result;
-}
-
-} // namespace
-
-MarkerTest::MarkerCookie& MarkerTest::findMarker(YGMarker markerType) {
-  return find(markerCookies.begin(), markerCookies.end(), markerType);
-}
-
-MarkerTest::MarkerCookie& MarkerTest::findLastMarker(YGMarker markerType) {
-  return find(markerCookies.rbegin(), markerCookies.rend(), markerType);
-}
-
-void MarkerTest::SetUp() {
-  config = uniquePtr<YGConfig>{YGConfigNew(), &YGConfigFree};
-  YGConfigSetMarkerCallbacks(config.get(), {startMarker, endMarker});
-}
-
-void MarkerTest::TearDown() {
-  markerCookies.resize(0);
-}
-
-decltype(MarkerTest::markerCookies) MarkerTest::markerCookies = {};
-
-} // namespace test
-} // namespace marker
-} // namespace yoga
-} // namespace facebook
-
-bool operator==(const YGMarkerLayoutData& lhs, const YGMarkerLayoutData& rhs) {
-  return lhs.layouts == rhs.layouts && lhs.measures == rhs.measures &&
-      lhs.maxMeasureCache == rhs.maxMeasureCache &&
-      lhs.cachedLayouts == rhs.cachedLayouts &&
-      lhs.cachedMeasures == rhs.cachedMeasures;
-}
-
-void PrintTo(const YGMarkerLayoutData data, std::ostream* os) {
-  *os << "YGMarkerLayoutData{ layouts = " << data.layouts
-      << ", measures = " << data.measures
-      << ", maxMeasureCache = " << data.maxMeasureCache
-      << ", cachedLayouts = " << data.cachedLayouts
-      << ", cachedMeasures = " << data.cachedMeasures << " }";
-}
diff --git a/yoga/YGConfig.h b/yoga/YGConfig.h
index aaf6d137..b1bce612 100644
--- a/yoga/YGConfig.h
+++ b/yoga/YGConfig.h
@@ -5,7 +5,6 @@
  * file in the root directory of this source tree.
  */
 #pragma once
-#include "YGMarker.h"
 #include "Yoga-internal.h"
 #include "Yoga.h"
 
@@ -44,7 +43,6 @@ public:
   std::array<bool, facebook::yoga::enums::count<YGExperimentalFeature>()>
       experimentalFeatures = {};
   void* context = nullptr;
-  YGMarkerCallbacks markerCallbacks = {nullptr, nullptr};
 
   YGConfig(YGLogger logger);
   void log(YGConfig*, YGNode*, YGLogLevel, void*, const char*, va_list);
diff --git a/yoga/YGMarker.cpp b/yoga/YGMarker.cpp
deleted file mode 100644
index e0758e23..00000000
--- a/yoga/YGMarker.cpp
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the LICENSE
- * file in the root directory of this source tree.
- */
-#include "YGMarker.h"
-#include "YGConfig.h"
-
-void YGConfigSetMarkerCallbacks(
-    YGConfigRef config,
-    YGMarkerCallbacks markerCallbacks) {
-  config->markerCallbacks = markerCallbacks;
-}
diff --git a/yoga/YGMarker.h b/yoga/YGMarker.h
deleted file mode 100644
index 025e246a..00000000
--- a/yoga/YGMarker.h
+++ /dev/null
@@ -1,74 +0,0 @@
-/*
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the LICENSE
- * file in the root directory of this source tree.
- */
-#pragma once
-
-#include "YGMacros.h"
-
-YG_EXTERN_C_BEGIN
-
-typedef struct YGNode* YGNodeRef;
-typedef struct YGConfig* YGConfigRef;
-
-typedef YG_ENUM_BEGIN(YGMarker) {}
-YG_ENUM_END(YGMarker);
-
-typedef struct {
-  int layouts;
-  int measures;
-  int maxMeasureCache;
-  int cachedLayouts;
-  int cachedMeasures;
-  int measureCallbacks;
-} YGMarkerLayoutData;
-
-typedef struct {
-  bool _unused;
-} YGMarkerNoData;
-
-typedef union {
-  YGMarkerNoData* noData;
-} YGMarkerData;
-
-typedef struct {
-  // accepts marker type, a node ref, and marker data (depends on marker type)
-  // can return a handle or id that Yoga will pass to endMarker
-  void* (*startMarker)(YGMarker, YGNodeRef, YGMarkerData);
-  // accepts marker type, a node ref, marker data, and marker id as returned by
-  // startMarker
-  void (*endMarker)(YGMarker, YGNodeRef, YGMarkerData, void* id);
-} YGMarkerCallbacks;
-
-void YGConfigSetMarkerCallbacks(YGConfigRef, YGMarkerCallbacks);
-
-YG_EXTERN_C_END
-
-#ifdef __cplusplus
-
-namespace facebook {
-namespace yoga {
-namespace marker {
-namespace detail {
-
-template <YGMarker M>
-struct MarkerData;
-
-struct NoMarkerData {
-  using type = YGMarkerNoData;
-  static type*& get(YGMarkerData& d) { return d.noData; }
-};
-} // namespace detail
-
-template <YGMarker M>
-typename detail::MarkerData<M>::type* data(YGMarkerData d) {
-  return detail::MarkerData<M>::get(d);
-}
-
-} // namespace marker
-} // namespace yoga
-} // namespace facebook
-
-#endif // __cplusplus
diff --git a/yoga/Yoga.cpp b/yoga/Yoga.cpp
index e3cc78bc..caffe000 100644
--- a/yoga/Yoga.cpp
+++ b/yoga/Yoga.cpp
@@ -15,7 +15,6 @@
 #include "YGNodePrint.h"
 #include "Yoga-internal.h"
 #include "event/event.h"
-#include "instrumentation.h"
 #ifdef _MSC_VER
 #include <float.h>
 
@@ -941,7 +940,7 @@ bool YGLayoutNodeInternal(
     const bool performLayout,
     const char* reason,
     const YGConfigRef config,
-    YGMarkerLayoutData& layoutMarkerData,
+    LayoutData& layoutMarkerData,
     void* const layoutContext,
     const uint32_t depth,
     const uint32_t generationCount);
@@ -1191,7 +1190,7 @@ static void YGNodeComputeFlexBasisForChild(
     const YGMeasureMode heightMode,
     const YGDirection direction,
     const YGConfigRef config,
-    YGMarkerLayoutData& layoutMarkerData,
+    LayoutData& layoutMarkerData,
     void* const layoutContext,
     const uint32_t depth,
     const uint32_t generationCount) {
@@ -1387,7 +1386,7 @@ static void YGNodeAbsoluteLayoutChild(
     const float height,
     const YGDirection direction,
     const YGConfigRef config,
-    YGMarkerLayoutData& layoutMarkerData,
+    LayoutData& layoutMarkerData,
     void* const layoutContext,
     const uint32_t depth,
     const uint32_t generationCount) {
@@ -1588,7 +1587,7 @@ static void YGNodeWithMeasureFuncSetMeasuredDimensions(
     const YGMeasureMode heightMeasureMode,
     const float ownerWidth,
     const float ownerHeight,
-    YGMarkerLayoutData& layoutMarkerData,
+    LayoutData& layoutMarkerData,
     void* const layoutContext) {
   YGAssertWithNode(
       node,
@@ -1836,7 +1835,7 @@ static float YGNodeComputeFlexBasisForChildren(
     YGFlexDirection mainAxis,
     const YGConfigRef config,
     bool performLayout,
-    YGMarkerLayoutData& layoutMarkerData,
+    LayoutData& layoutMarkerData,
     void* const layoutContext,
     const uint32_t depth,
     const uint32_t generationCount) {
@@ -2020,7 +2019,7 @@ static float YGDistributeFreeSpaceSecondPass(
     const YGMeasureMode measureModeCrossDim,
     const bool performLayout,
     const YGConfigRef config,
-    YGMarkerLayoutData& layoutMarkerData,
+    LayoutData& layoutMarkerData,
     void* const layoutContext,
     const uint32_t depth,
     const uint32_t generationCount) {
@@ -2321,7 +2320,7 @@ static void YGResolveFlexibleLength(
     const YGMeasureMode measureModeCrossDim,
     const bool performLayout,
     const YGConfigRef config,
-    YGMarkerLayoutData& layoutMarkerData,
+    LayoutData& layoutMarkerData,
     void* const layoutContext,
     const uint32_t depth,
     const uint32_t generationCount) {
@@ -2651,7 +2650,7 @@ static void YGNodelayoutImpl(
     const float ownerHeight,
     const bool performLayout,
     const YGConfigRef config,
-    YGMarkerLayoutData& layoutMarkerData,
+    LayoutData& layoutMarkerData,
     void* const layoutContext,
     const uint32_t depth,
     const uint32_t generationCount) {
@@ -3707,7 +3706,7 @@ bool YGLayoutNodeInternal(
     const bool performLayout,
     const char* reason,
     const YGConfigRef config,
-    YGMarkerLayoutData& layoutMarkerData,
+    LayoutData& layoutMarkerData,
     void* const layoutContext,
     uint32_t depth,
     const uint32_t generationCount) {
@@ -4065,7 +4064,7 @@ void YGNodeCalculateLayoutWithContext(
     void* layoutContext) {
 
   Event::publish<Event::LayoutPassStart>(node, {layoutContext});
-  YGMarkerLayoutData markerData = {};
+  LayoutData markerData = {};
 
   // Increment the generation count. This will force the recursive routine to
   // visit all dirty nodes at least once. Subsequent visits will be skipped if
@@ -4161,7 +4160,7 @@ void YGNodeCalculateLayoutWithContext(
     gCurrentGenerationCount++;
     // Rerun the layout, and calculate the diff
     unsetUseLegacyFlagRecursively(nodeWithoutLegacyFlag);
-    YGMarkerLayoutData layoutMarkerData = {};
+    LayoutData layoutMarkerData = {};
     if (YGLayoutNodeInternal(
             nodeWithoutLegacyFlag,
             width,
diff --git a/yoga/event/event.h b/yoga/event/event.h
index 2043cc8c..dc49cefc 100644
--- a/yoga/event/event.h
+++ b/yoga/event/event.h
@@ -9,7 +9,6 @@
 #include <functional>
 #include <vector>
 #include <yoga/YGEnums.h>
-#include <yoga/YGMarker.h>
 
 struct YGConfig;
 struct YGNode;
@@ -24,6 +23,15 @@ enum LayoutType : int {
   kCachedMeasure = 3
 };
 
+struct LayoutData {
+  int layouts;
+  int measures;
+  int maxMeasureCache;
+  int cachedLayouts;
+  int cachedMeasures;
+  int measureCallbacks;
+};
+
 struct Event {
   enum Type {
     NodeAllocation,
@@ -94,7 +102,7 @@ struct Event::TypedData<Event::LayoutPassStart> {
 template <>
 struct Event::TypedData<Event::LayoutPassEnd> {
   void* layoutContext;
-  YGMarkerLayoutData* layoutData;
+  LayoutData* layoutData;
 };
 
 template <>
diff --git a/yoga/instrumentation.h b/yoga/instrumentation.h
deleted file mode 100644
index 369703a1..00000000
--- a/yoga/instrumentation.h
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the LICENSE
- * file in the root directory of this source tree.
- */
-#include "YGConfig.h"
-#include "YGMarker.h"
-#include "YGNode.h"
-
-namespace facebook {
-namespace yoga {
-namespace marker {
-
-template <YGMarker MarkerType>
-class MarkerSection {
-private:
-  using Data = detail::MarkerData<MarkerType>;
-
-public:
-  MarkerSection(YGNodeRef node) : MarkerSection{node, node->getConfig()} {}
-  void end() {
-    if (endMarker_) {
-      endMarker_(MarkerType, node_, markerData(&data), userData_);
-      endMarker_ = nullptr;
-    }
-  }
-  ~MarkerSection() { end(); }
-
-  typename Data::type data = {};
-
-  template <typename Ret, typename... Args>
-  static Ret wrap(
-      YGNodeRef node,
-      Ret (YGNode::*method)(Args...),
-      Args... args) {
-    MarkerSection<MarkerType> section{node};
-    return (node->*method)(std::forward<Args>(args)...);
-  }
-
-private:
-  decltype(YGMarkerCallbacks{}.endMarker) endMarker_;
-  YGNodeRef node_;
-  void* userData_;
-
-  MarkerSection(YGNodeRef node, YGConfigRef config)
-      : MarkerSection{node, config ? &config->markerCallbacks : nullptr} {}
-  MarkerSection(YGNodeRef node, YGMarkerCallbacks* callbacks)
-      : endMarker_{callbacks ? callbacks->endMarker : nullptr},
-        node_{node},
-        userData_{
-            callbacks && callbacks->startMarker
-                ? callbacks->startMarker(MarkerType, node, markerData(&data))
-                : nullptr} {}
-
-  static YGMarkerData markerData(typename Data::type* d) {
-    YGMarkerData markerData = {};
-    Data::get(markerData) = d;
-    return markerData;
-  }
-};
-
-} // namespace marker
-} // namespace yoga
-} // namespace facebook