diff --git a/metricsd/aidl/android/brillo/metrics/IMetricsd.aidl b/metricsd/aidl/android/brillo/metrics/IMetricsd.aidl
index a92ff46..aa3cb34 100644
--- a/metricsd/aidl/android/brillo/metrics/IMetricsd.aidl
+++ b/metricsd/aidl/android/brillo/metrics/IMetricsd.aidl
@@ -22,4 +22,5 @@
   oneway void recordLinearHistogram(String name, int sample, int max);
   oneway void recordSparseHistogram(String name, int sample);
   oneway void recordCrash(String type);
+  String getHistogramsDump();
 }
diff --git a/metricsd/c_metrics_library.cc b/metricsd/c_metrics_library.cc
index 0503876..47a543e 100644
--- a/metricsd/c_metrics_library.cc
+++ b/metricsd/c_metrics_library.cc
@@ -66,14 +66,6 @@
   return lib->SendSparseToUMA(std::string(name), sample);
 }
 
-extern "C" int CMetricsLibrarySendUserActionToUMA(CMetricsLibrary handle,
-                                                  const char* action) {
-  MetricsLibrary* lib = reinterpret_cast<MetricsLibrary*>(handle);
-  if (lib == NULL)
-    return 0;
-  return lib->SendUserActionToUMA(std::string(action));
-}
-
 extern "C" int CMetricsLibrarySendCrashToUMA(CMetricsLibrary handle,
                                             const char* crash_kind) {
   MetricsLibrary* lib = reinterpret_cast<MetricsLibrary*>(handle);
diff --git a/metricsd/include/metrics/c_metrics_library.h b/metricsd/include/metrics/c_metrics_library.h
index 4e7e666..1e597c2 100644
--- a/metricsd/include/metrics/c_metrics_library.h
+++ b/metricsd/include/metrics/c_metrics_library.h
@@ -44,10 +44,6 @@
 int CMetricsLibrarySendSparseToUMA(CMetricsLibrary handle,
                                    const char* name, int sample);
 
-// C wrapper for MetricsLibrary::SendUserActionToUMA.
-int CMetricsLibrarySendUserActionToUMA(CMetricsLibrary handle,
-                                       const char* action);
-
 // C wrapper for MetricsLibrary::SendCrashToUMA.
 int CMetricsLibrarySendCrashToUMA(CMetricsLibrary handle,
                                   const char* crash_kind);
diff --git a/metricsd/include/metrics/metrics_library.h b/metricsd/include/metrics/metrics_library.h
index 37dda50..a1bb926 100644
--- a/metricsd/include/metrics/metrics_library.h
+++ b/metricsd/include/metrics/metrics_library.h
@@ -44,7 +44,6 @@
   virtual bool SendEnumToUMA(const std::string& name, int sample, int max) = 0;
   virtual bool SendBoolToUMA(const std::string& name, bool sample) = 0;
   virtual bool SendSparseToUMA(const std::string& name, int sample) = 0;
-  virtual bool SendUserActionToUMA(const std::string& action) = 0;
   virtual ~MetricsLibraryInterface() {}
 };
 
@@ -114,18 +113,6 @@
   // |sample| is the 32-bit integer value to be recorded.
   bool SendSparseToUMA(const std::string& name, int sample) override;
 
-  // Sends a user action to Chrome for transport to UMA and returns true on
-  // success. This method results in the equivalent of an asynchronous
-  // non-blocking RPC to UserMetrics::RecordAction.  The new metric must be
-  // added to chrome/tools/extract_actions.py in the Chromium repository, which
-  // should then be run to generate a hash for the new action.
-  //
-  // Until http://crosbug.com/11125 is fixed, the metric must also be added to
-  // chrome/browser/chromeos/external_metrics.cc.
-  //
-  // |action| is the user-generated event (e.g., "MuteKeyPressed").
-  bool SendUserActionToUMA(const std::string& action) override;
-
   // Sends a signal to UMA that a crash of the given |crash_kind|
   // has occurred.  Used by UMA to generate stability statistics.
   bool SendCrashToUMA(const char *crash_kind);
@@ -138,6 +125,11 @@
   // number in the histograms dashboard).
   bool SendCrosEventToUMA(const std::string& event);
 
+  // Debugging only.
+  // Dumps the histograms aggregated since metricsd started into |dump|.
+  // Returns true iff the dump succeeds.
+  bool GetHistogramsDump(std::string* dump);
+
  private:
   friend class CMetricsLibraryTest;
   friend class MetricsLibraryTest;
diff --git a/metricsd/include/metrics/metrics_library_mock.h b/metricsd/include/metrics/metrics_library_mock.h
index db56f9e..3b0b24d 100644
--- a/metricsd/include/metrics/metrics_library_mock.h
+++ b/metricsd/include/metrics/metrics_library_mock.h
@@ -34,7 +34,6 @@
                                    int max));
   MOCK_METHOD2(SendBoolToUMA, bool(const std::string& name, bool sample));
   MOCK_METHOD2(SendSparseToUMA, bool(const std::string& name, int sample));
-  MOCK_METHOD1(SendUserActionToUMA, bool(const std::string& action));
 
   bool AreMetricsEnabled() override {return metrics_enabled_;};
 };
diff --git a/metricsd/metrics_client.cc b/metricsd/metrics_client.cc
index 5d73555..c66b975 100644
--- a/metricsd/metrics_client.cc
+++ b/metricsd/metrics_client.cc
@@ -17,16 +17,14 @@
 #include <cstdio>
 #include <cstdlib>
 
-#include <base/memory/scoped_vector.h>
-
 #include "constants.h"
 #include "metrics/metrics_library.h"
 
 enum Mode {
+    kModeDumpHistograms,
     kModeSendSample,
     kModeSendEnumSample,
     kModeSendSparseSample,
-    kModeSendUserAction,
     kModeSendCrosEvent,
     kModeHasConsent,
     kModeIsGuestMode,
@@ -38,18 +36,17 @@
           "        metrics_client -e   name sample max\n"
           "        metrics_client -s   name sample\n"
           "        metrics_client -v   event\n"
-          "        metrics_client -u action\n"
           "        metrics_client [-cdg]\n"
           "\n"
           "  default: send metric with integer values \n"
           "           |min| > 0, |min| <= sample < |max|\n"
           "  -c: return exit status 0 if user consents to stats, 1 otherwise,\n"
           "      in guest mode always return 1\n"
+          "  -d: dump the histograms recorded by metricsd to stdout\n"
           "  -e: send linear/enumeration histogram data\n"
           "  -g: return exit status 0 if machine in guest mode, 1 otherwise\n"
           "  -s: send a sparse histogram sample\n"
           "  -t: convert sample from double seconds to int milliseconds\n"
-          "  -u: send a user action to Chrome\n"
           "  -v: send a Platform.CrOSEvent enum histogram sample\n");
   exit(1);
 }
@@ -74,6 +71,20 @@
   return value;
 }
 
+static int DumpHistograms() {
+  MetricsLibrary metrics_lib;
+  metrics_lib.Init();
+
+  std::string dump;
+  if (!metrics_lib.GetHistogramsDump(&dump)) {
+    printf("Failed to dump the histograms.");
+    return 1;
+  }
+
+  printf("%s\n", dump.c_str());
+  return 0;
+}
+
 static int SendStats(char* argv[],
                      int name_index,
                      enum Mode mode,
@@ -102,14 +113,6 @@
   return 0;
 }
 
-static int SendUserAction(char* argv[], int action_index) {
-  const char* action = argv[action_index];
-  MetricsLibrary metrics_lib;
-  metrics_lib.Init();
-  metrics_lib.SendUserActionToUMA(action);
-  return 0;
-}
-
 static int SendCrosEvent(char* argv[], int action_index) {
   const char* event = argv[action_index];
   bool result;
@@ -141,11 +144,14 @@
 
   // Parse arguments
   int flag;
-  while ((flag = getopt(argc, argv, "abcegstuv")) != -1) {
+  while ((flag = getopt(argc, argv, "abcdegstv")) != -1) {
     switch (flag) {
       case 'c':
         mode = kModeHasConsent;
         break;
+      case 'd':
+        mode = kModeDumpHistograms;
+        break;
       case 'e':
         mode = kModeSendEnumSample;
         break;
@@ -158,9 +164,6 @@
       case 't':
         secs_to_msecs = true;
         break;
-      case 'u':
-        mode = kModeSendUserAction;
-        break;
       case 'v':
         mode = kModeSendCrosEvent;
         break;
@@ -178,8 +181,6 @@
     expected_args = 3;
   else if (mode == kModeSendSparseSample)
     expected_args = 2;
-  else if (mode == kModeSendUserAction)
-    expected_args = 1;
   else if (mode == kModeSendCrosEvent)
     expected_args = 1;
 
@@ -188,6 +189,8 @@
   }
 
   switch (mode) {
+    case kModeDumpHistograms:
+      return DumpHistograms();
     case kModeSendSample:
     case kModeSendEnumSample:
     case kModeSendSparseSample:
@@ -198,8 +201,6 @@
                        arg_index,
                        mode,
                        secs_to_msecs);
-    case kModeSendUserAction:
-      return SendUserAction(argv, arg_index);
     case kModeSendCrosEvent:
       return SendCrosEvent(argv, arg_index);
     case kModeHasConsent:
diff --git a/metricsd/metrics_library.cc b/metricsd/metrics_library.cc
index bc0aadd..d211ab4 100644
--- a/metricsd/metrics_library.cc
+++ b/metricsd/metrics_library.cc
@@ -200,13 +200,6 @@
              .isOk();
 }
 
-bool MetricsLibrary::SendUserActionToUMA(const std::string& action) {
-  // Deprecated.
-  // TODO(bsimonnet): Delete this method entirely once all the callers are
-  // removed (b/25818567).
-  return true;
-}
-
 bool MetricsLibrary::SendCrashToUMA(const char* crash_kind) {
   return CheckService() &&
          metricsd_proxy_->recordCrash(String16(crash_kind)).isOk();
@@ -220,3 +213,14 @@
   }
   return false;
 }
+
+bool MetricsLibrary::GetHistogramsDump(std::string* dump) {
+  android::String16 temp_dump;
+  if (!CheckService() ||
+      !metricsd_proxy_->getHistogramsDump(&temp_dump).isOk()) {
+    return false;
+  }
+
+  *dump = android::String8(temp_dump).string();
+  return true;
+}
diff --git a/metricsd/uploader/bn_metricsd_impl.cc b/metricsd/uploader/bn_metricsd_impl.cc
index 1e38002..113a705 100644
--- a/metricsd/uploader/bn_metricsd_impl.cc
+++ b/metricsd/uploader/bn_metricsd_impl.cc
@@ -18,6 +18,7 @@
 
 #include <base/metrics/histogram.h>
 #include <base/metrics/sparse_histogram.h>
+#include <base/metrics/statistics_recorder.h>
 #include <binder/IPCThreadState.h>
 #include <binder/IServiceManager.h>
 #include <utils/String16.h>
@@ -96,3 +97,10 @@
   }
   return Status::ok();
 }
+
+Status BnMetricsdImpl::getHistogramsDump(String16* dump) {
+  std::string str_dump;
+  base::StatisticsRecorder::WriteGraph(std::string(), &str_dump);
+  *dump = String16(str_dump.c_str());
+  return Status::ok();
+}
diff --git a/metricsd/uploader/bn_metricsd_impl.h b/metricsd/uploader/bn_metricsd_impl.h
index c6e3d36..016ccb6 100644
--- a/metricsd/uploader/bn_metricsd_impl.h
+++ b/metricsd/uploader/bn_metricsd_impl.h
@@ -47,6 +47,9 @@
   // Records a crash.
   android::binder::Status recordCrash(const android::String16& type) override;
 
+  // Returns a dump of the histograms aggregated in memory.
+  android::binder::Status getHistogramsDump(android::String16* dump) override;
+
  private:
   std::shared_ptr<CrashCounters> counters_;
 };