cmds/statsd/src/metrics/GaugeMetricProducer.cpp - platform/frameworks/base - Gitiles

 /*
 * Copyright (C) 2017 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.
 */

 #define DEBUG true  // STOPSHIP if true
 #include "Log.h"

 #include "GaugeMetricProducer.h"
 #include "stats_util.h"

 #include <cutils/log.h>
 #include <limits.h>
 #include <stdlib.h>

 using android::util::FIELD_COUNT_REPEATED;
 using android::util::FIELD_TYPE_BOOL;
 using android::util::FIELD_TYPE_FLOAT;
 using android::util::FIELD_TYPE_INT32;
 using android::util::FIELD_TYPE_INT64;
 using android::util::FIELD_TYPE_MESSAGE;
 using android::util::ProtoOutputStream;
 using std::map;
 using std::string;
 using std::unordered_map;
 using std::vector;

 namespace android {
 namespace os {
 namespace statsd {

 // for StatsLogReport
 const int FIELD_ID_METRIC_ID = 1;
 const int FIELD_ID_START_REPORT_NANOS = 2;
 const int FIELD_ID_END_REPORT_NANOS = 3;
 const int FIELD_ID_GAUGE_METRICS = 8;
 // for GaugeMetricDataWrapper
 const int FIELD_ID_DATA = 1;
 // for GaugeMetricData
 const int FIELD_ID_DIMENSION = 1;
 const int FIELD_ID_BUCKET_INFO = 2;
 // for KeyValuePair
 const int FIELD_ID_KEY = 1;
 const int FIELD_ID_VALUE_STR = 2;
 const int FIELD_ID_VALUE_INT = 3;
 const int FIELD_ID_VALUE_BOOL = 4;
 const int FIELD_ID_VALUE_FLOAT = 5;
 // for GaugeBucketInfo
 const int FIELD_ID_START_BUCKET_NANOS = 1;
 const int FIELD_ID_END_BUCKET_NANOS = 2;
 const int FIELD_ID_GAUGE = 3;

 GaugeMetricProducer::GaugeMetricProducer(const GaugeMetric& metric, const int conditionIndex,
                                          const sp<ConditionWizard>& wizard, const int pullTagId)
     : MetricProducer((time(nullptr) * NS_PER_SEC), conditionIndex, wizard),
       mMetric(metric),
       mPullTagId(pullTagId) {
     if (metric.has_bucket() && metric.bucket().has_bucket_size_millis()) {
         mBucketSizeNs = metric.bucket().bucket_size_millis() * 1000 * 1000;
     } else {
         mBucketSizeNs = kDefaultGaugemBucketSizeNs;
     }

     // TODO: use UidMap if uid->pkg_name is required
     mDimension.insert(mDimension.begin(), metric.dimension().begin(), metric.dimension().end());

     if (metric.links().size() > 0) {
         mConditionLinks.insert(mConditionLinks.begin(), metric.links().begin(),
                                metric.links().end());
         mConditionSliced = true;
     }

     // Kicks off the puller immediately.
     if (mPullTagId != -1) {
         mStatsPullerManager.RegisterReceiver(mPullTagId, this,
                                              metric.bucket().bucket_size_millis());
     }

     startNewProtoOutputStream(mStartTimeNs);

     VLOG("metric %lld created. bucket size %lld start_time: %lld", metric.metric_id(),
          (long long)mBucketSizeNs, (long long)mStartTimeNs);
 }

 GaugeMetricProducer::~GaugeMetricProducer() {
     VLOG("~GaugeMetricProducer() called");
 }

 void GaugeMetricProducer::startNewProtoOutputStream(long long startTime) {
     mProto = std::make_unique<ProtoOutputStream>();
     mProto->write(FIELD_TYPE_INT32 | FIELD_ID_METRIC_ID, mMetric.metric_id());
     mProto->write(FIELD_TYPE_INT64 | FIELD_ID_START_REPORT_NANOS, startTime);
     mProtoToken = mProto->start(FIELD_TYPE_MESSAGE | FIELD_ID_GAUGE_METRICS);
 }

 void GaugeMetricProducer::finish() {
 }

 std::unique_ptr<std::vector<uint8_t>> GaugeMetricProducer::onDumpReport() {
     VLOG("gauge metric %lld dump report now...", mMetric.metric_id());

     // Dump current bucket if it's stale.
     // If current bucket is still on-going, don't force dump current bucket.
     // In finish(), We can force dump current bucket.
     flushGaugeIfNeededLocked(time(nullptr) * NS_PER_SEC);

     for (const auto& pair : mPastBuckets) {
         const HashableDimensionKey& hashableKey = pair.first;
         auto it = mDimensionKeyMap.find(hashableKey);
         if (it == mDimensionKeyMap.end()) {
             ALOGE("Dimension key %s not found?!?! skip...", hashableKey.c_str());
             continue;
         }

         VLOG("  dimension key %s", hashableKey.c_str());
         long long wrapperToken =
                 mProto->start(FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED | FIELD_ID_DATA);

         // First fill dimension (KeyValuePairs).
         for (const auto& kv : it->second) {
             long long dimensionToken =
                     mProto->start(FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED | FIELD_ID_DIMENSION);
             mProto->write(FIELD_TYPE_INT32 | FIELD_ID_KEY, kv.key());
             if (kv.has_value_str()) {
                 mProto->write(FIELD_TYPE_INT32 | FIELD_ID_VALUE_STR, kv.value_str());
             } else if (kv.has_value_int()) {
                 mProto->write(FIELD_TYPE_INT64 | FIELD_ID_VALUE_INT, kv.value_int());
             } else if (kv.has_value_bool()) {
                 mProto->write(FIELD_TYPE_BOOL | FIELD_ID_VALUE_BOOL, kv.value_bool());
             } else if (kv.has_value_float()) {
                 mProto->write(FIELD_TYPE_FLOAT | FIELD_ID_VALUE_FLOAT, kv.value_float());
             }
             mProto->end(dimensionToken);
         }

         // Then fill bucket_info (GaugeBucketInfo).
         for (const auto& bucket : pair.second) {
             long long bucketInfoToken =
                     mProto->start(FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED | FIELD_ID_BUCKET_INFO);
             mProto->write(FIELD_TYPE_INT64 | FIELD_ID_START_BUCKET_NANOS,
                           (long long)bucket.mBucketStartNs);
             mProto->write(FIELD_TYPE_INT64 | FIELD_ID_END_BUCKET_NANOS,
                           (long long)bucket.mBucketEndNs);
             mProto->write(FIELD_TYPE_INT64 | FIELD_ID_GAUGE, (long long)bucket.mGauge);
             mProto->end(bucketInfoToken);
             VLOG("\t bucket [%lld - %lld] count: %lld", (long long)bucket.mBucketStartNs,
                  (long long)bucket.mBucketEndNs, (long long)bucket.mGauge);
         }
         mProto->end(wrapperToken);
     }
     mProto->end(mProtoToken);
     mProto->write(FIELD_TYPE_INT64 | FIELD_ID_END_REPORT_NANOS,
                   (long long)mCurrentBucketStartTimeNs);

     std::unique_ptr<std::vector<uint8_t>> buffer = serializeProto();

     startNewProtoOutputStream(time(nullptr) * NS_PER_SEC);
     mPastBuckets.clear();
     mByteSize = 0;

     return buffer;

     // TODO: Clear mDimensionKeyMap once the report is dumped.
 }

 void GaugeMetricProducer::onConditionChanged(const bool conditionMet, const uint64_t eventTime) {
     AutoMutex _l(mLock);
     VLOG("Metric %lld onConditionChanged", mMetric.metric_id());
     mCondition = conditionMet;

     // Push mode. Nothing to do.
     if (mPullTagId == -1) {
         return;
     }
     // If (1) the condition is not met or (2) we already pulled the gauge metric in the current
     // bucket, do not pull gauge again.
     if (!mCondition || mCurrentSlicedBucket.size() > 0) {
         return;
     }
     vector<std::shared_ptr<LogEvent>> allData;
     if (!mStatsPullerManager.Pull(mPullTagId, &allData)) {
         ALOGE("Stats puller failed for tag: %d", mPullTagId);
         return;
     }
     for (const auto& data : allData) {
         onMatchedLogEvent(0, *data, false /*scheduledPull*/);
     }
     flushGaugeIfNeededLocked(eventTime);
 }

 void GaugeMetricProducer::onSlicedConditionMayChange(const uint64_t eventTime) {
     VLOG("Metric %lld onSlicedConditionMayChange", mMetric.metric_id());
 }

 long GaugeMetricProducer::getGauge(const LogEvent& event) {
     status_t err = NO_ERROR;
     long val = event.GetLong(mMetric.gauge_field(), &err);
     if (err == NO_ERROR) {
         return val;
     } else {
         VLOG("Can't find value in message.");
         return -1;
     }
 }

 void GaugeMetricProducer::onDataPulled(const std::vector<std::shared_ptr<LogEvent>>& allData) {
     AutoMutex mutex(mLock);
     if (allData.size() == 0) {
         return;
     }
     for (const auto& data : allData) {
         onMatchedLogEvent(0, *data, true /*scheduledPull*/);
     }
     uint64_t eventTime = allData.at(0)->GetTimestampNs();
     flushGaugeIfNeededLocked(eventTime);
 }

 void GaugeMetricProducer::onMatchedLogEventInternal(
         const size_t matcherIndex, const HashableDimensionKey& eventKey,
         const map<string, HashableDimensionKey>& conditionKey, bool condition,
         const LogEvent& event, bool scheduledPull) {
     if (condition == false) {
         return;
     }
     uint64_t eventTimeNs = event.GetTimestampNs();
     if (eventTimeNs < mCurrentBucketStartTimeNs) {
         VLOG("Skip event due to late arrival: %lld vs %lld", (long long)eventTimeNs,
              (long long)mCurrentBucketStartTimeNs);
         return;
     }

     // For gauge metric, we just simply use the latest guage in the given bucket.
     const long gauge = getGauge(event);
     if (gauge < 0) {
         VLOG("Invalid gauge at event Time: %lld", (long long)eventTimeNs);
         return;
     }
     mCurrentSlicedBucket[eventKey] = gauge;
     if (mPullTagId < 0) {
         flushGaugeIfNeededLocked(eventTimeNs);
     }
 }

 // When a new matched event comes in, we check if event falls into the current
 // bucket. If not, flush the old counter to past buckets and initialize the new
 // bucket.
 // if data is pushed, onMatchedLogEvent will only be called through onConditionChanged() inside
 // the GaugeMetricProducer while holding the lock.
 void GaugeMetricProducer::flushGaugeIfNeededLocked(const uint64_t eventTimeNs) {
     if (mCurrentBucketStartTimeNs + mBucketSizeNs > eventTimeNs) {
         VLOG("event time is %lld, less than next bucket start time %lld", (long long)eventTimeNs,
              (long long)(mCurrentBucketStartTimeNs + mBucketSizeNs));
         return;
     }

     // Adjusts the bucket start time
     int64_t numBucketsForward = (eventTimeNs - mCurrentBucketStartTimeNs) / mBucketSizeNs;

     GaugeBucket info;
     info.mBucketStartNs = mCurrentBucketStartTimeNs;
     info.mBucketEndNs = mCurrentBucketStartTimeNs + mBucketSizeNs;

     for (const auto& slice : mCurrentSlicedBucket) {
         info.mGauge = slice.second;
         auto& bucketList = mPastBuckets[slice.first];
         bucketList.push_back(info);
         mByteSize += sizeof(info);

         VLOG("gauge metric %lld, dump key value: %s -> %ld", mMetric.metric_id(),
              slice.first.c_str(), slice.second);
     }
     // Reset counters
     mCurrentSlicedBucket.clear();

     mCurrentBucketStartTimeNs = mCurrentBucketStartTimeNs + numBucketsForward * mBucketSizeNs;
     VLOG("metric %lld: new bucket start time: %lld", mMetric.metric_id(),
          (long long)mCurrentBucketStartTimeNs);
 }

 size_t GaugeMetricProducer::byteSize() {
     return mByteSize;
 }

 }  // namespace statsd
 }  // namespace os
 }  // namespace android
	/*
	* Copyright (C) 2017 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.
	*/

	#define DEBUG true // STOPSHIP if true
	#include "Log.h"

	#include "GaugeMetricProducer.h"
	#include "stats_util.h"

	#include <cutils/log.h>
	#include <limits.h>
	#include <stdlib.h>

	using android::util::FIELD_COUNT_REPEATED;
	using android::util::FIELD_TYPE_BOOL;
	using android::util::FIELD_TYPE_FLOAT;
	using android::util::FIELD_TYPE_INT32;
	using android::util::FIELD_TYPE_INT64;
	using android::util::FIELD_TYPE_MESSAGE;
	using android::util::ProtoOutputStream;
	using std::map;
	using std::string;
	using std::unordered_map;
	using std::vector;

	namespace android {
	namespace os {
	namespace statsd {

	// for StatsLogReport
	const int FIELD_ID_METRIC_ID = 1;
	const int FIELD_ID_START_REPORT_NANOS = 2;
	const int FIELD_ID_END_REPORT_NANOS = 3;
	const int FIELD_ID_GAUGE_METRICS = 8;
	// for GaugeMetricDataWrapper
	const int FIELD_ID_DATA = 1;
	// for GaugeMetricData
	const int FIELD_ID_DIMENSION = 1;
	const int FIELD_ID_BUCKET_INFO = 2;
	// for KeyValuePair
	const int FIELD_ID_KEY = 1;
	const int FIELD_ID_VALUE_STR = 2;
	const int FIELD_ID_VALUE_INT = 3;
	const int FIELD_ID_VALUE_BOOL = 4;
	const int FIELD_ID_VALUE_FLOAT = 5;
	// for GaugeBucketInfo
	const int FIELD_ID_START_BUCKET_NANOS = 1;
	const int FIELD_ID_END_BUCKET_NANOS = 2;
	const int FIELD_ID_GAUGE = 3;

	GaugeMetricProducer::GaugeMetricProducer(const GaugeMetric& metric, const int conditionIndex,
	const sp<ConditionWizard>& wizard, const int pullTagId)
	: MetricProducer((time(nullptr) * NS_PER_SEC), conditionIndex, wizard),
	mMetric(metric),
	mPullTagId(pullTagId) {
	if (metric.has_bucket() && metric.bucket().has_bucket_size_millis()) {
	mBucketSizeNs = metric.bucket().bucket_size_millis() * 1000 * 1000;
	} else {
	mBucketSizeNs = kDefaultGaugemBucketSizeNs;
	}

	// TODO: use UidMap if uid->pkg_name is required
	mDimension.insert(mDimension.begin(), metric.dimension().begin(), metric.dimension().end());

	if (metric.links().size() > 0) {
	mConditionLinks.insert(mConditionLinks.begin(), metric.links().begin(),
	metric.links().end());
	mConditionSliced = true;
	}

	// Kicks off the puller immediately.
	if (mPullTagId != -1) {
	mStatsPullerManager.RegisterReceiver(mPullTagId, this,
	metric.bucket().bucket_size_millis());
	}

	startNewProtoOutputStream(mStartTimeNs);

	VLOG("metric %lld created. bucket size %lld start_time: %lld", metric.metric_id(),
	(long long)mBucketSizeNs, (long long)mStartTimeNs);
	}

	GaugeMetricProducer::~GaugeMetricProducer() {
	VLOG("~GaugeMetricProducer() called");
	}

	void GaugeMetricProducer::startNewProtoOutputStream(long long startTime) {
	mProto = std::make_unique<ProtoOutputStream>();
	mProto->write(FIELD_TYPE_INT32 \| FIELD_ID_METRIC_ID, mMetric.metric_id());
	mProto->write(FIELD_TYPE_INT64 \| FIELD_ID_START_REPORT_NANOS, startTime);
	mProtoToken = mProto->start(FIELD_TYPE_MESSAGE \| FIELD_ID_GAUGE_METRICS);
	}

	void GaugeMetricProducer::finish() {
	}

	std::unique_ptr<std::vector<uint8_t>> GaugeMetricProducer::onDumpReport() {
	VLOG("gauge metric %lld dump report now...", mMetric.metric_id());

	// Dump current bucket if it's stale.
	// If current bucket is still on-going, don't force dump current bucket.
	// In finish(), We can force dump current bucket.
	flushGaugeIfNeededLocked(time(nullptr) * NS_PER_SEC);

	for (const auto& pair : mPastBuckets) {
	const HashableDimensionKey& hashableKey = pair.first;
	auto it = mDimensionKeyMap.find(hashableKey);
	if (it == mDimensionKeyMap.end()) {
	ALOGE("Dimension key %s not found?!?! skip...", hashableKey.c_str());
	continue;
	}

	VLOG(" dimension key %s", hashableKey.c_str());
	long long wrapperToken =
	mProto->start(FIELD_TYPE_MESSAGE \| FIELD_COUNT_REPEATED \| FIELD_ID_DATA);

	// First fill dimension (KeyValuePairs).
	for (const auto& kv : it->second) {
	long long dimensionToken =
	mProto->start(FIELD_TYPE_MESSAGE \| FIELD_COUNT_REPEATED \| FIELD_ID_DIMENSION);
	mProto->write(FIELD_TYPE_INT32 \| FIELD_ID_KEY, kv.key());
	if (kv.has_value_str()) {
	mProto->write(FIELD_TYPE_INT32 \| FIELD_ID_VALUE_STR, kv.value_str());
	} else if (kv.has_value_int()) {
	mProto->write(FIELD_TYPE_INT64 \| FIELD_ID_VALUE_INT, kv.value_int());
	} else if (kv.has_value_bool()) {
	mProto->write(FIELD_TYPE_BOOL \| FIELD_ID_VALUE_BOOL, kv.value_bool());
	} else if (kv.has_value_float()) {
	mProto->write(FIELD_TYPE_FLOAT \| FIELD_ID_VALUE_FLOAT, kv.value_float());
	}
	mProto->end(dimensionToken);
	}

	// Then fill bucket_info (GaugeBucketInfo).
	for (const auto& bucket : pair.second) {
	long long bucketInfoToken =
	mProto->start(FIELD_TYPE_MESSAGE \| FIELD_COUNT_REPEATED \| FIELD_ID_BUCKET_INFO);
	mProto->write(FIELD_TYPE_INT64 \| FIELD_ID_START_BUCKET_NANOS,
	(long long)bucket.mBucketStartNs);
	mProto->write(FIELD_TYPE_INT64 \| FIELD_ID_END_BUCKET_NANOS,
	(long long)bucket.mBucketEndNs);
	mProto->write(FIELD_TYPE_INT64 \| FIELD_ID_GAUGE, (long long)bucket.mGauge);
	mProto->end(bucketInfoToken);
	VLOG("\t bucket [%lld - %lld] count: %lld", (long long)bucket.mBucketStartNs,
	(long long)bucket.mBucketEndNs, (long long)bucket.mGauge);
	}
	mProto->end(wrapperToken);
	}
	mProto->end(mProtoToken);
	mProto->write(FIELD_TYPE_INT64 \| FIELD_ID_END_REPORT_NANOS,
	(long long)mCurrentBucketStartTimeNs);

	std::unique_ptr<std::vector<uint8_t>> buffer = serializeProto();

	startNewProtoOutputStream(time(nullptr) * NS_PER_SEC);
	mPastBuckets.clear();
	mByteSize = 0;

	return buffer;

	// TODO: Clear mDimensionKeyMap once the report is dumped.
	}

	void GaugeMetricProducer::onConditionChanged(const bool conditionMet, const uint64_t eventTime) {
	AutoMutex _l(mLock);
	VLOG("Metric %lld onConditionChanged", mMetric.metric_id());
	mCondition = conditionMet;

	// Push mode. Nothing to do.
	if (mPullTagId == -1) {
	return;
	}
	// If (1) the condition is not met or (2) we already pulled the gauge metric in the current
	// bucket, do not pull gauge again.
	if (!mCondition \|\| mCurrentSlicedBucket.size() > 0) {
	return;
	}
	vector<std::shared_ptr<LogEvent>> allData;
	if (!mStatsPullerManager.Pull(mPullTagId, &allData)) {
	ALOGE("Stats puller failed for tag: %d", mPullTagId);
	return;
	}
	for (const auto& data : allData) {
	onMatchedLogEvent(0, data, false /scheduledPull*/);
	}
	flushGaugeIfNeededLocked(eventTime);
	}

	void GaugeMetricProducer::onSlicedConditionMayChange(const uint64_t eventTime) {
	VLOG("Metric %lld onSlicedConditionMayChange", mMetric.metric_id());
	}

	long GaugeMetricProducer::getGauge(const LogEvent& event) {
	status_t err = NO_ERROR;
	long val = event.GetLong(mMetric.gauge_field(), &err);
	if (err == NO_ERROR) {
	return val;
	} else {
	VLOG("Can't find value in message.");
	return -1;
	}
	}

	void GaugeMetricProducer::onDataPulled(const std::vector<std::shared_ptr<LogEvent>>& allData) {
	AutoMutex mutex(mLock);
	if (allData.size() == 0) {
	return;
	}
	for (const auto& data : allData) {
	onMatchedLogEvent(0, data, true /scheduledPull*/);
	}
	uint64_t eventTime = allData.at(0)->GetTimestampNs();
	flushGaugeIfNeededLocked(eventTime);
	}

	void GaugeMetricProducer::onMatchedLogEventInternal(
	const size_t matcherIndex, const HashableDimensionKey& eventKey,
	const map<string, HashableDimensionKey>& conditionKey, bool condition,
	const LogEvent& event, bool scheduledPull) {
	if (condition == false) {
	return;
	}
	uint64_t eventTimeNs = event.GetTimestampNs();
	if (eventTimeNs < mCurrentBucketStartTimeNs) {
	VLOG("Skip event due to late arrival: %lld vs %lld", (long long)eventTimeNs,
	(long long)mCurrentBucketStartTimeNs);
	return;
	}

	// For gauge metric, we just simply use the latest guage in the given bucket.
	const long gauge = getGauge(event);
	if (gauge < 0) {
	VLOG("Invalid gauge at event Time: %lld", (long long)eventTimeNs);
	return;
	}
	mCurrentSlicedBucket[eventKey] = gauge;
	if (mPullTagId < 0) {
	flushGaugeIfNeededLocked(eventTimeNs);
	}
	}

	// When a new matched event comes in, we check if event falls into the current
	// bucket. If not, flush the old counter to past buckets and initialize the new
	// bucket.
	// if data is pushed, onMatchedLogEvent will only be called through onConditionChanged() inside
	// the GaugeMetricProducer while holding the lock.
	void GaugeMetricProducer::flushGaugeIfNeededLocked(const uint64_t eventTimeNs) {
	if (mCurrentBucketStartTimeNs + mBucketSizeNs > eventTimeNs) {
	VLOG("event time is %lld, less than next bucket start time %lld", (long long)eventTimeNs,
	(long long)(mCurrentBucketStartTimeNs + mBucketSizeNs));
	return;
	}

	// Adjusts the bucket start time
	int64_t numBucketsForward = (eventTimeNs - mCurrentBucketStartTimeNs) / mBucketSizeNs;

	GaugeBucket info;
	info.mBucketStartNs = mCurrentBucketStartTimeNs;
	info.mBucketEndNs = mCurrentBucketStartTimeNs + mBucketSizeNs;

	for (const auto& slice : mCurrentSlicedBucket) {
	info.mGauge = slice.second;
	auto& bucketList = mPastBuckets[slice.first];
	bucketList.push_back(info);
	mByteSize += sizeof(info);

	VLOG("gauge metric %lld, dump key value: %s -> %ld", mMetric.metric_id(),
	slice.first.c_str(), slice.second);
	}
	// Reset counters
	mCurrentSlicedBucket.clear();

	mCurrentBucketStartTimeNs = mCurrentBucketStartTimeNs + numBucketsForward * mBucketSizeNs;
	VLOG("metric %lld: new bucket start time: %lld", mMetric.metric_id(),
	(long long)mCurrentBucketStartTimeNs);
	}

	size_t GaugeMetricProducer::byteSize() {
	return mByteSize;
	}

	} // namespace statsd
	} // namespace os
	} // namespace android