diff --git a/cmds/incidentd/Android.mk b/cmds/incidentd/Android.mk
index 2b00d9e..23cd2af 100644
--- a/cmds/incidentd/Android.mk
+++ b/cmds/incidentd/Android.mk
@@ -56,6 +56,7 @@
         libcutils \
         libincident \
         liblog \
+        libprotobuf-cpp-lite \
         libprotoutil \
         libselinux \
         libservices \
diff --git a/cmds/incidentd/src/Privacy.cpp b/cmds/incidentd/src/Privacy.cpp
index 3f0e331..c5078f0 100644
--- a/cmds/incidentd/src/Privacy.cpp
+++ b/cmds/incidentd/src/Privacy.cpp
@@ -73,11 +73,6 @@
         case android::os::DEST_LOCAL:
             return PrivacySpec(dest);
         default:
-            return PrivacySpec();
+            return PrivacySpec(android::os::DEST_AUTOMATIC);
     }
 }
-
-PrivacySpec PrivacySpec::get_default_dropbox_spec()
-{
-    return PrivacySpec(android::os::DEST_AUTOMATIC);
-}
diff --git a/cmds/incidentd/src/Privacy.h b/cmds/incidentd/src/Privacy.h
index 4f3db67..ce1b8e9 100644
--- a/cmds/incidentd/src/Privacy.h
+++ b/cmds/incidentd/src/Privacy.h
@@ -75,7 +75,6 @@
 
     // Constructs spec using static methods below.
     static PrivacySpec new_spec(int dest);
-    static PrivacySpec get_default_dropbox_spec();
 private:
     PrivacySpec(uint8_t dest) : dest(dest) {}
 };
diff --git a/cmds/incidentd/src/Reporter.cpp b/cmds/incidentd/src/Reporter.cpp
index b9f479b..06baeba 100644
--- a/cmds/incidentd/src/Reporter.cpp
+++ b/cmds/incidentd/src/Reporter.cpp
@@ -18,6 +18,7 @@
 
 #include "Reporter.h"
 
+#include "Privacy.h"
 #include "report_directory.h"
 #include "section_list.h"
 
@@ -65,7 +66,9 @@
     :mRequests(),
      mSections(),
      mMainFd(-1),
-     mMainDest(-1)
+     mMainDest(-1),
+     mMetadata(),
+     mSectionStats()
 {
 }
 
@@ -79,18 +82,32 @@
 {
     mRequests.push_back(request);
     mSections.merge(request->args);
+    mMetadata.set_request_size(mMetadata.request_size() + 1);
 }
 
 void
 ReportRequestSet::setMainFd(int fd)
 {
     mMainFd = fd;
+    mMetadata.set_use_dropbox(fd > 0);
 }
 
 void
 ReportRequestSet::setMainDest(int dest)
 {
     mMainDest = dest;
+    PrivacySpec spec = PrivacySpec::new_spec(dest);
+    switch (spec.dest) {
+        case android::os::DEST_AUTOMATIC:
+            mMetadata.set_dest(IncidentMetadata_Destination_AUTOMATIC);
+            break;
+        case android::os::DEST_EXPLICIT:
+            mMetadata.set_dest(IncidentMetadata_Destination_EXPLICIT);
+            break;
+        case android::os::DEST_LOCAL:
+            mMetadata.set_dest(IncidentMetadata_Destination_LOCAL);
+            break;
+    }
 }
 
 bool
@@ -98,6 +115,16 @@
     return mSections.containsSection(id);
 }
 
+IncidentMetadata::SectionStats*
+ReportRequestSet::sectionStats(int id) {
+    if (mSectionStats.find(id) == mSectionStats.end()) {
+        auto stats = mMetadata.add_sections();
+        stats->set_id(id);
+        mSectionStats[id] = stats;
+    }
+    return mSectionStats[id];
+}
+
 // ================================================================================
 Reporter::Reporter() : Reporter(INCIDENT_DIRECTORY) { isTest = false; };
 
@@ -128,12 +155,12 @@
 Reporter::run_report_status_t
 Reporter::runReport()
 {
-
     status_t err = NO_ERROR;
     bool needMainFd = false;
     int mainFd = -1;
     int mainDest = -1;
     HeaderSection headers;
+    MetadataSection metadataSection;
 
     // See if we need the main file
     for (ReportRequestSet::iterator it=batch.begin(); it!=batch.end(); it++) {
@@ -182,7 +209,7 @@
         const int id = (*section)->id;
         if (this->batch.containsSection(id)) {
             ALOGD("Taking incident report section %d '%s'", id, (*section)->name.string());
-            // Notify listener of starting
+            // Notify listener of starting.
             for (ReportRequestSet::iterator it=batch.begin(); it!=batch.end(); it++) {
                 if ((*it)->listener != NULL && (*it)->args.containsSection(id)) {
                     (*it)->listener->onReportSectionStatus(id,
@@ -191,14 +218,20 @@
             }
 
             // Execute - go get the data and write it into the file descriptors.
+            auto stats = batch.sectionStats(id);
+            int64_t startTime = uptimeMillis();
             err = (*section)->Execute(&batch);
+            int64_t endTime = uptimeMillis();
+
+            stats->set_success(err == NO_ERROR);
+            stats->set_exec_duration_ms(endTime - startTime);
             if (err != NO_ERROR) {
                 ALOGW("Incident section %s (%d) failed: %s. Stopping report.",
                         (*section)->name.string(), id, strerror(-err));
                 goto DONE;
             }
 
-            // Notify listener of starting
+            // Notify listener of ending.
             for (ReportRequestSet::iterator it=batch.begin(); it!=batch.end(); it++) {
                 if ((*it)->listener != NULL && (*it)->args.containsSection(id)) {
                     (*it)->listener->onReportSectionStatus(id,
@@ -210,6 +243,9 @@
     }
 
 DONE:
+    // Reports the metdadata when taking the incident report.
+    if (!isTest) metadataSection.Execute(&batch);
+
     // Close the file.
     if (mainFd >= 0) {
         close(mainFd);
diff --git a/cmds/incidentd/src/Reporter.h b/cmds/incidentd/src/Reporter.h
index f30ecf0..6058068 100644
--- a/cmds/incidentd/src/Reporter.h
+++ b/cmds/incidentd/src/Reporter.h
@@ -17,9 +17,12 @@
 #ifndef REPORTER_H
 #define REPORTER_H
 
+#include "frameworks/base/libs/incident/proto/android/os/metadata.pb.h"
+
 #include <android/os/IIncidentReportStatusListener.h>
 #include <android/os/IncidentReportArgs.h>
 
+#include <map>
 #include <string>
 #include <vector>
 
@@ -61,13 +64,20 @@
     iterator end() { return mRequests.end(); }
 
     int mainFd() { return mMainFd; }
-    bool containsSection(int id);
     int mainDest() { return mMainDest; }
+    IncidentMetadata& metadata() { return mMetadata; }
+
+    bool containsSection(int id);
+    IncidentMetadata::SectionStats* sectionStats(int id);
+
 private:
     vector<sp<ReportRequest>> mRequests;
     IncidentReportArgs mSections;
     int mMainFd;
     int mMainDest;
+
+    IncidentMetadata mMetadata;
+    map<int, IncidentMetadata::SectionStats*> mSectionStats;
 };
 
 // ================================================================================
@@ -81,8 +91,8 @@
 
     ReportRequestSet batch;
 
-    Reporter();
-    Reporter(const char* directory);
+    Reporter(); // PROD must use this constructor.
+    Reporter(const char* directory); // For testing purpose only.
     virtual ~Reporter();
 
     // Run the report as described in the batch and args parameters.
diff --git a/cmds/incidentd/src/Section.cpp b/cmds/incidentd/src/Section.cpp
index faeab87..3c76298 100644
--- a/cmds/incidentd/src/Section.cpp
+++ b/cmds/incidentd/src/Section.cpp
@@ -45,6 +45,7 @@
 
 // special section ids
 const int FIELD_ID_INCIDENT_HEADER = 1;
+const int FIELD_ID_INCIDENT_METADATA = 2;
 
 // incident section parameters
 const int   WAIT_MAX = 5;
@@ -149,6 +150,12 @@
     EncodedBuffer::iterator data = buffer.data();
     PrivacyBuffer privacyBuffer(get_privacy_of_section(id), data);
     int writeable = 0;
+    auto stats = requests->sectionStats(id);
+
+    stats->set_dump_size_bytes(data.size());
+    stats->set_dump_duration_ms(buffer.durationMs());
+    stats->set_timed_out(buffer.timedOut());
+    stats->set_is_truncated(buffer.truncated());
 
     // The streaming ones, group requests by spec in order to save unnecessary strip operations
     map<PrivacySpec, vector<sp<ReportRequest>>> requestsBySpec;
@@ -182,9 +189,7 @@
 
     // The dropbox file
     if (requests->mainFd() >= 0) {
-        PrivacySpec spec = requests->mainDest() < 0 ?
-                PrivacySpec::get_default_dropbox_spec() :
-                PrivacySpec::new_spec(requests->mainDest());
+        PrivacySpec spec = PrivacySpec::new_spec(requests->mainDest());
         err = privacyBuffer.strip(spec);
         if (err != NO_ERROR) return err; // the buffer data is corrupted.
         if (privacyBuffer.size() == 0) goto DONE;
@@ -196,6 +201,7 @@
         writeable++;
         ALOGD("Section %d flushed %zu bytes to dropbox %d with spec %d", id,
               privacyBuffer.size(), requests->mainFd(), spec.dest);
+        stats->set_report_size_bytes(privacyBuffer.size());
     }
 
 DONE:
@@ -236,7 +242,7 @@
 
             // So the idea is only requests with negative fd are written to dropbox file.
             int fd = request->fd >= 0 ? request->fd : requests->mainFd();
-            write_section_header(fd, FIELD_ID_INCIDENT_HEADER, buf->size());
+            write_section_header(fd, id, buf->size());
             write_all(fd, (uint8_t const*)buf->data(), buf->size());
             // If there was an error now, there will be an error later and we will remove
             // it from the list then.
@@ -244,7 +250,35 @@
     }
     return NO_ERROR;
 }
+// ================================================================================
+MetadataSection::MetadataSection()
+    :Section(FIELD_ID_INCIDENT_METADATA, 0)
+{
+}
 
+MetadataSection::~MetadataSection()
+{
+}
+
+status_t
+MetadataSection::Execute(ReportRequestSet* requests) const
+{
+    std::string metadataBuf;
+    requests->metadata().SerializeToString(&metadataBuf);
+    for (ReportRequestSet::iterator it=requests->begin(); it!=requests->end(); it++) {
+        const sp<ReportRequest> request = *it;
+        if (metadataBuf.empty() || request->fd < 0 || request->err != NO_ERROR) {
+            continue;
+        }
+        write_section_header(request->fd, id, metadataBuf.size());
+        write_all(request->fd, (uint8_t const*)metadataBuf.data(), metadataBuf.size());
+    }
+    if (requests->mainFd() >= 0 && !metadataBuf.empty()) {
+        write_section_header(requests->mainFd(), id, metadataBuf.size());
+        write_all(requests->mainFd(), (uint8_t const*)metadataBuf.data(), metadataBuf.size());
+    }
+    return NO_ERROR;
+}
 // ================================================================================
 FileSection::FileSection(int id, const char* filename, const int64_t timeoutMs)
     :Section(id, timeoutMs),
diff --git a/cmds/incidentd/src/Section.h b/cmds/incidentd/src/Section.h
index d440ee9..80cc033 100644
--- a/cmds/incidentd/src/Section.h
+++ b/cmds/incidentd/src/Section.h
@@ -59,6 +59,18 @@
 };
 
 /**
+ * Section that generates incident metadata.
+ */
+class MetadataSection : public Section
+{
+public:
+    MetadataSection();
+    virtual ~MetadataSection();
+
+    virtual status_t Execute(ReportRequestSet* requests) const;
+};
+
+/**
  * Section that reads in a file.
  */
 class FileSection : public Section
diff --git a/cmds/incidentd/tests/Reporter_test.cpp b/cmds/incidentd/tests/Reporter_test.cpp
index c494bd6..a1e3c34 100644
--- a/cmds/incidentd/tests/Reporter_test.cpp
+++ b/cmds/incidentd/tests/Reporter_test.cpp
@@ -180,3 +180,18 @@
     ASSERT_EQ((int)results.size(), 1);
     EXPECT_EQ(results[0], "\n\x2" "\b\f\n\x6" "\x12\x4" "abcd");
 }
+
+TEST_F(ReporterTest, ReportMetadata) {
+    IncidentReportArgs args;
+    args.addSection(1);
+    args.setDest(android::os::DEST_EXPLICIT);
+    sp<ReportRequest> r = new ReportRequest(args, l, -1);
+    reporter->batch.add(r);
+
+    ASSERT_EQ(Reporter::REPORT_FINISHED, reporter->runReport());
+    auto metadata = reporter->batch.metadata();
+    EXPECT_EQ(IncidentMetadata_Destination_EXPLICIT, metadata.dest());
+    EXPECT_EQ(1, metadata.request_size());
+    EXPECT_TRUE(metadata.use_dropbox());
+    EXPECT_EQ(0, metadata.sections_size());
+}
\ No newline at end of file
diff --git a/cmds/incidentd/tests/Section_test.cpp b/cmds/incidentd/tests/Section_test.cpp
index 2cfd7df..5752a67 100644
--- a/cmds/incidentd/tests/Section_test.cpp
+++ b/cmds/incidentd/tests/Section_test.cpp
@@ -18,6 +18,7 @@
 
 #include <android-base/file.h>
 #include <android-base/test_utils.h>
+#include <android/os/IncidentReportArgs.h>
 #include <frameworks/base/libs/incident/proto/android/os/header.pb.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
@@ -89,6 +90,18 @@
     EXPECT_THAT(content, StrEq("\n\x05\x12\x03pup"));
 }
 
+TEST(SectionTest, MetadataSection) {
+    MetadataSection ms;
+    ReportRequestSet requests;
+
+    requests.setMainFd(STDOUT_FILENO);
+    requests.sectionStats(1)->set_success(true);
+
+    CaptureStdout();
+    ASSERT_EQ(NO_ERROR, ms.Execute(&requests));
+    EXPECT_THAT(GetCapturedStdout(), StrEq("\x12\b\x18\x1\"\x4\b\x1\x10\x1"));
+}
+
 TEST(SectionTest, FileSection) {
     TemporaryFile tf;
     FileSection fs(REVERSE_PARSER, tf.path);
@@ -243,8 +256,9 @@
 
     IncidentReportArgs args1, args2, args3;
     args1.setAll(true);
-    args1.setDest(0); // LOCAL
-    args2.setAll(true); // default to explicit
+    args1.setDest(android::os::DEST_LOCAL);
+    args2.setAll(true);
+    args2.setDest(android::os::DEST_EXPLICIT);
     sp<SimpleListener> l = new SimpleListener();
     requests.add(new ReportRequest(args1, l, output1.fd));
     requests.add(new ReportRequest(args2, l, output2.fd));
@@ -283,10 +297,12 @@
 
     ASSERT_TRUE(WriteStringToFile(VARINT_FIELD_1 + STRING_FIELD_2 + FIX64_FIELD_3, input.path));
 
-    IncidentReportArgs args1, args2, args3, args4;
+    IncidentReportArgs args1, args2, args3;
     args1.setAll(true);
+    args1.setDest(android::os::DEST_EXPLICIT);
     args2.setAll(true);
-    args4.setAll(true);
+    args2.setDest(android::os::DEST_EXPLICIT);
+    args3.setAll(true);
     sp<SimpleListener> l = new SimpleListener();
     requests.add(new ReportRequest(args1, l, output1.fd));
     requests.add(new ReportRequest(args2, l, output2.fd));
@@ -307,7 +323,8 @@
     EXPECT_TRUE(ReadFileToString(output2.path, &content));
     EXPECT_THAT(content, StrEq(string("\x02") + c + expect));
 
-    // because args3 doesn't set section, so it should receive nothing
+    // output3 has only auto field
+    c = (char) STRING_FIELD_2.size();
     EXPECT_TRUE(ReadFileToString(output3.path, &content));
-    EXPECT_THAT(content, StrEq(""));
+    EXPECT_THAT(content, StrEq(string("\x02") + c + STRING_FIELD_2));
 }
\ No newline at end of file
diff --git a/core/proto/android/os/incident.proto b/core/proto/android/os/incident.proto
index 698f394..f9dd882 100644
--- a/core/proto/android/os/incident.proto
+++ b/core/proto/android/os/incident.proto
@@ -46,18 +46,12 @@
 import "frameworks/base/core/proto/android/util/event_log_tags.proto";
 import "frameworks/base/core/proto/android/util/log.proto";
 import "frameworks/base/libs/incident/proto/android/os/header.proto";
+import "frameworks/base/libs/incident/proto/android/os/metadata.proto";
 import "frameworks/base/libs/incident/proto/android/privacy.proto";
 import "frameworks/base/libs/incident/proto/android/section.proto";
 
 package android.os;
 
-// This field contains internal metadata associated with an incident report,
-// such as the section ids and privacy policy specs from caller as well as how long
-// and how many bytes a section takes, etc.
-message IncidentMetadata {
-
-}
-
 // privacy field options must not be set at this level because all
 // the sections are able to be controlled and configured by section ids.
 // Instead privacy field options need to be configured in each section proto message.
diff --git a/libs/incident/Android.mk b/libs/incident/Android.mk
index b63400f..08c8346 100644
--- a/libs/incident/Android.mk
+++ b/libs/incident/Android.mk
@@ -33,6 +33,7 @@
         ../../core/java/android/os/IIncidentManager.aidl \
         ../../core/java/android/os/IIncidentReportStatusListener.aidl \
         proto/android/os/header.proto \
+        proto/android/os/metadata.proto \
         src/IncidentReportArgs.cpp
 
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
diff --git a/libs/incident/proto/android/os/metadata.proto b/libs/incident/proto/android/os/metadata.proto
new file mode 100644
index 0000000..a1e89b0
--- /dev/null
+++ b/libs/incident/proto/android/os/metadata.proto
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+syntax = "proto2";
+option java_multiple_files = true;
+
+package android.os;
+
+// This field contains internal metadata associated with an incident report,
+// such as the section ids and privacy policy specs from caller as well as how long
+// and how many bytes a section takes, etc.
+message IncidentMetadata {
+
+    // privacy level of the incident report.
+    enum Destination {
+        AUTOMATIC = 0;
+        EXPLICIT = 1;
+        LOCAL = 2;
+    }
+    optional Destination dest = 1;
+
+    optional int32 request_size = 2;
+
+    optional bool use_dropbox = 3;
+
+    // stats of each section taken in this incident report.
+    message SectionStats {
+        // section id.
+        optional int32 id = 1;
+        // if the section is successfully taken.
+        optional bool success = 2;
+        // number of bytes in the report after filtering.
+        optional int32 report_size_bytes = 3;
+        // the total duration to execute the section.
+        optional int64 exec_duration_ms = 4;
+
+        // number of bytes dumped from the section directly.
+        optional int32 dump_size_bytes = 5;
+        // duration of the dump takes.
+        optional int64 dump_duration_ms = 6;
+        // true if the section timed out.
+        optional bool timed_out = 7;
+        // true if the section is truncated.
+        optional bool is_truncated = 8;
+
+        // Next Tag: 9
+    }
+    repeated SectionStats sections = 4;
+}
+