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 false  // STOPSHIP if true
 #include "Log.h"

 #include "GaugeMetricProducer.h"
 #include "guardrail/StatsdStats.h"
 #include "dimension.h"
 #include "stats_log_util.h"

 #include <cutils/log.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::FIELD_TYPE_STRING;
 using android::util::ProtoOutputStream;
 using std::map;
 using std::string;
 using std::unordered_map;
 using std::vector;
 using std::make_shared;
 using std::shared_ptr;

 namespace android {
 namespace os {
 namespace statsd {

 // for StatsLogReport
 const int FIELD_ID_NAME = 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 GaugeBucketInfo
 const int FIELD_ID_START_BUCKET_NANOS = 1;
 const int FIELD_ID_END_BUCKET_NANOS = 2;
 const int FIELD_ID_ATOM = 3;

 GaugeMetricProducer::GaugeMetricProducer(const ConfigKey& key, const GaugeMetric& metric,
                                          const int conditionIndex,
                                          const sp<ConditionWizard>& wizard, const int atomTagId,
                                          const int pullTagId, const uint64_t startTimeNs,
                                          shared_ptr<StatsPullerManager> statsPullerManager)
     : MetricProducer(metric.name(), key, startTimeNs, conditionIndex, wizard),
       mStatsPullerManager(statsPullerManager),
       mPullTagId(pullTagId),
       mAtomTagId(atomTagId) {
     mCurrentSlicedBucket = std::make_shared<DimToGaugeFieldsMap>();
     mCurrentSlicedBucketForAnomaly = std::make_shared<DimToValMap>();
     if (metric.has_bucket() && metric.bucket().has_bucket_size_millis()) {
         mBucketSizeNs = metric.bucket().bucket_size_millis() * 1000 * 1000;
     } else {
         mBucketSizeNs = kDefaultGaugemBucketSizeNs;
     }

     mFieldFilter = metric.gauge_fields_filter();

     // TODO: use UidMap if uid->pkg_name is required
     mDimensions = metric.dimensions();

     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());
     }

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

 // for testing
 GaugeMetricProducer::GaugeMetricProducer(const ConfigKey& key, const GaugeMetric& metric,
                                          const int conditionIndex,
                                          const sp<ConditionWizard>& wizard, const int pullTagId,
                                          const int atomTagId, const int64_t startTimeNs)
     : GaugeMetricProducer(key, metric, conditionIndex, wizard, pullTagId, atomTagId, startTimeNs,
                           make_shared<StatsPullerManager>()) {
 }

 GaugeMetricProducer::~GaugeMetricProducer() {
     VLOG("~GaugeMetricProducer() called");
     if (mPullTagId != -1) {
         mStatsPullerManager->UnRegisterReceiver(mPullTagId, this);
     }
 }

 void GaugeMetricProducer::onDumpReportLocked(const uint64_t dumpTimeNs, StatsLogReport* report) {
     flushIfNeededLocked(dumpTimeNs);
 }

 void GaugeMetricProducer::onDumpReportLocked(const uint64_t dumpTimeNs,
                                              ProtoOutputStream* protoOutput) {
     VLOG("gauge metric %s dump report now...", mName.c_str());

     flushIfNeededLocked(dumpTimeNs);

     protoOutput->write(FIELD_TYPE_STRING | FIELD_ID_NAME, mName);
     protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_START_REPORT_NANOS, (long long)mStartTimeNs);
     long long protoToken = protoOutput->start(FIELD_TYPE_MESSAGE | FIELD_ID_GAUGE_METRICS);

     for (const auto& pair : mPastBuckets) {
         const HashableDimensionKey& hashableKey = pair.first;

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

         // First fill dimension.
         long long dimensionToken = protoOutput->start(
                 FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED | FIELD_ID_DIMENSION);
         writeDimensionsValueProtoToStream(hashableKey.getDimensionsValue(), protoOutput);
         protoOutput->end(dimensionToken);

         // Then fill bucket_info (GaugeBucketInfo).
         for (const auto& bucket : pair.second) {
             long long bucketInfoToken = protoOutput->start(
                     FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED | FIELD_ID_BUCKET_INFO);
             protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_START_BUCKET_NANOS,
                                (long long)bucket.mBucketStartNs);
             protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_END_BUCKET_NANOS,
                                (long long)bucket.mBucketEndNs);
             long long atomToken = protoOutput->start(FIELD_TYPE_MESSAGE | FIELD_ID_ATOM);
             writeFieldValueTreeToStream(*bucket.mGaugeFields, protoOutput);
             protoOutput->end(atomToken);
             protoOutput->end(bucketInfoToken);
             VLOG("\t bucket [%lld - %lld] includes %d gauge fields.", (long long)bucket.mBucketStartNs,
                  (long long)bucket.mBucketEndNs, (int)bucket.mGaugeFields->size());
         }
         protoOutput->end(wrapperToken);
     }
     protoOutput->end(protoToken);
     protoOutput->write(FIELD_TYPE_INT64 | FIELD_ID_END_REPORT_NANOS, (long long)dumpTimeNs);

     mPastBuckets.clear();
     mStartTimeNs = mCurrentBucketStartTimeNs;
     // TODO: Clear mDimensionKeyMap once the report is dumped.
 }

 void GaugeMetricProducer::onConditionChangedLocked(const bool conditionMet,
                                                    const uint64_t eventTime) {
     VLOG("Metric %s onConditionChanged", mName.c_str());
     flushIfNeededLocked(eventTime);
     mCondition = conditionMet;

     // Push mode. No need to proactively pull the gauge data.
     if (mPullTagId == -1) {
         return;
     }
     // No need to pull again. Either scheduled pull or condition on true happened
     if (!mCondition) {
         return;
     }
     // Already have gauge metric for the current bucket, do not do it again.
     if (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) {
         onMatchedLogEventLocked(0, *data);
     }
     flushIfNeededLocked(eventTime);
 }

 void GaugeMetricProducer::onSlicedConditionMayChangeLocked(const uint64_t eventTime) {
     VLOG("Metric %s onSlicedConditionMayChange", mName.c_str());
 }

 std::shared_ptr<FieldValueMap> GaugeMetricProducer::getGaugeFields(const LogEvent& event) {
     std::shared_ptr<FieldValueMap> gaugeFields =
         std::make_shared<FieldValueMap>(event.getFieldValueMap());
     if (!mFieldFilter.include_all()) {
         filterFields(mFieldFilter.fields(), gaugeFields.get());
     }
     return gaugeFields;
 }

 void GaugeMetricProducer::onDataPulled(const std::vector<std::shared_ptr<LogEvent>>& allData) {
     std::lock_guard<std::mutex> lock(mMutex);
     if (allData.size() == 0) {
         return;
     }
     for (const auto& data : allData) {
         onMatchedLogEventLocked(0, *data);
     }
 }

 bool GaugeMetricProducer::hitGuardRailLocked(const HashableDimensionKey& newKey) {
     if (mCurrentSlicedBucket->find(newKey) != mCurrentSlicedBucket->end()) {
         return false;
     }
     // 1. Report the tuple count if the tuple count > soft limit
     if (mCurrentSlicedBucket->size() > StatsdStats::kDimensionKeySizeSoftLimit - 1) {
         size_t newTupleCount = mCurrentSlicedBucket->size() + 1;
         StatsdStats::getInstance().noteMetricDimensionSize(mConfigKey, mName, newTupleCount);
         // 2. Don't add more tuples, we are above the allowed threshold. Drop the data.
         if (newTupleCount > StatsdStats::kDimensionKeySizeHardLimit) {
             ALOGE("GaugeMetric %s dropping data for dimension key %s", mName.c_str(),
                   newKey.c_str());
             return true;
         }
     }

     return false;
 }

 void GaugeMetricProducer::onMatchedLogEventInternalLocked(
         const size_t matcherIndex, const HashableDimensionKey& eventKey,
         const ConditionKey& conditionKey, bool condition,
         const LogEvent& event) {
     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;
     }
     flushIfNeededLocked(eventTimeNs);

     // For gauge metric, we just simply use the first gauge in the given bucket.
     if (mCurrentSlicedBucket->find(eventKey) != mCurrentSlicedBucket->end()) {
         return;
     }
     std::shared_ptr<FieldValueMap> gaugeFields = getGaugeFields(event);
     if (hitGuardRailLocked(eventKey)) {
         return;
     }
     (*mCurrentSlicedBucket)[eventKey] = gaugeFields;
     // Anomaly detection on gauge metric only works when there is one numeric
     // field specified.
     if (mAnomalyTrackers.size() > 0) {
         if (gaugeFields->size() == 1) {
             const DimensionsValue& dimensionsValue = gaugeFields->begin()->second;
             long gaugeVal = 0;
             if (dimensionsValue.has_value_int()) {
                 gaugeVal = (long)dimensionsValue.value_int();
             } else if (dimensionsValue.has_value_long()) {
                 gaugeVal = dimensionsValue.value_long();
             }
             for (auto& tracker : mAnomalyTrackers) {
                 tracker->detectAndDeclareAnomaly(eventTimeNs, mCurrentBucketNum, eventKey,
                                                  gaugeVal);
             }
         }
     }
 }

 void GaugeMetricProducer::updateCurrentSlicedBucketForAnomaly() {
     mCurrentSlicedBucketForAnomaly->clear();
     status_t err = NO_ERROR;
     for (const auto& slice : *mCurrentSlicedBucket) {
         const DimensionsValue& dimensionsValue = slice.second->begin()->second;
         long gaugeVal = 0;
         if (dimensionsValue.has_value_int()) {
             gaugeVal = (long)dimensionsValue.value_int();
         } else if (dimensionsValue.has_value_long()) {
             gaugeVal = dimensionsValue.value_long();
         }
         (*mCurrentSlicedBucketForAnomaly)[slice.first] = gaugeVal;
     }
 }

 // 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::flushIfNeededLocked(const uint64_t& eventTimeNs) {
     if (eventTimeNs < mCurrentBucketStartTimeNs + mBucketSizeNs) {
         VLOG("eventTime is %lld, less than next bucket start time %lld", (long long)eventTimeNs,
              (long long)(mCurrentBucketStartTimeNs + mBucketSizeNs));
         return;
     }

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

     for (const auto& slice : *mCurrentSlicedBucket) {
         info.mGaugeFields = slice.second;
         auto& bucketList = mPastBuckets[slice.first];
         bucketList.push_back(info);
         VLOG("gauge metric %s, dump key value: %s", mName.c_str(), slice.first.c_str());
     }

     // Reset counters
     if (mAnomalyTrackers.size() > 0) {
         updateCurrentSlicedBucketForAnomaly();
         for (auto& tracker : mAnomalyTrackers) {
             tracker->addPastBucket(mCurrentSlicedBucketForAnomaly, mCurrentBucketNum);
         }
     }

     mCurrentSlicedBucket = std::make_shared<DimToGaugeFieldsMap>();

     // Adjusts the bucket start time
     int64_t numBucketsForward = (eventTimeNs - mCurrentBucketStartTimeNs) / mBucketSizeNs;
     mCurrentBucketStartTimeNs = mCurrentBucketStartTimeNs + numBucketsForward * mBucketSizeNs;
     mCurrentBucketNum += numBucketsForward;
     VLOG("metric %s: new bucket start time: %lld", mName.c_str(),
          (long long)mCurrentBucketStartTimeNs);
 }

 size_t GaugeMetricProducer::byteSizeLocked() const {
     size_t totalSize = 0;
     for (const auto& pair : mPastBuckets) {
         totalSize += pair.second.size() * kBucketSize;
     }
     return totalSize;
 }

 }  // 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 false // STOPSHIP if true
	#include "Log.h"

	#include "GaugeMetricProducer.h"
	#include "guardrail/StatsdStats.h"
	#include "dimension.h"
	#include "stats_log_util.h"

	#include <cutils/log.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::FIELD_TYPE_STRING;
	using android::util::ProtoOutputStream;
	using std::map;
	using std::string;
	using std::unordered_map;
	using std::vector;
	using std::make_shared;
	using std::shared_ptr;

	namespace android {
	namespace os {
	namespace statsd {

	// for StatsLogReport
	const int FIELD_ID_NAME = 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 GaugeBucketInfo
	const int FIELD_ID_START_BUCKET_NANOS = 1;
	const int FIELD_ID_END_BUCKET_NANOS = 2;
	const int FIELD_ID_ATOM = 3;

	GaugeMetricProducer::GaugeMetricProducer(const ConfigKey& key, const GaugeMetric& metric,
	const int conditionIndex,
	const sp<ConditionWizard>& wizard, const int atomTagId,
	const int pullTagId, const uint64_t startTimeNs,
	shared_ptr<StatsPullerManager> statsPullerManager)
	: MetricProducer(metric.name(), key, startTimeNs, conditionIndex, wizard),
	mStatsPullerManager(statsPullerManager),
	mPullTagId(pullTagId),
	mAtomTagId(atomTagId) {
	mCurrentSlicedBucket = std::make_shared<DimToGaugeFieldsMap>();
	mCurrentSlicedBucketForAnomaly = std::make_shared<DimToValMap>();
	if (metric.has_bucket() && metric.bucket().has_bucket_size_millis()) {
	mBucketSizeNs = metric.bucket().bucket_size_millis() * 1000 * 1000;
	} else {
	mBucketSizeNs = kDefaultGaugemBucketSizeNs;
	}

	mFieldFilter = metric.gauge_fields_filter();

	// TODO: use UidMap if uid->pkg_name is required
	mDimensions = metric.dimensions();

	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());
	}

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

	// for testing
	GaugeMetricProducer::GaugeMetricProducer(const ConfigKey& key, const GaugeMetric& metric,
	const int conditionIndex,
	const sp<ConditionWizard>& wizard, const int pullTagId,
	const int atomTagId, const int64_t startTimeNs)
	: GaugeMetricProducer(key, metric, conditionIndex, wizard, pullTagId, atomTagId, startTimeNs,
	make_shared<StatsPullerManager>()) {
	}

	GaugeMetricProducer::~GaugeMetricProducer() {
	VLOG("~GaugeMetricProducer() called");
	if (mPullTagId != -1) {
	mStatsPullerManager->UnRegisterReceiver(mPullTagId, this);
	}
	}

	void GaugeMetricProducer::onDumpReportLocked(const uint64_t dumpTimeNs, StatsLogReport* report) {
	flushIfNeededLocked(dumpTimeNs);
	}

	void GaugeMetricProducer::onDumpReportLocked(const uint64_t dumpTimeNs,
	ProtoOutputStream* protoOutput) {
	VLOG("gauge metric %s dump report now...", mName.c_str());

	flushIfNeededLocked(dumpTimeNs);

	protoOutput->write(FIELD_TYPE_STRING \| FIELD_ID_NAME, mName);
	protoOutput->write(FIELD_TYPE_INT64 \| FIELD_ID_START_REPORT_NANOS, (long long)mStartTimeNs);
	long long protoToken = protoOutput->start(FIELD_TYPE_MESSAGE \| FIELD_ID_GAUGE_METRICS);

	for (const auto& pair : mPastBuckets) {
	const HashableDimensionKey& hashableKey = pair.first;

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

	// First fill dimension.
	long long dimensionToken = protoOutput->start(
	FIELD_TYPE_MESSAGE \| FIELD_COUNT_REPEATED \| FIELD_ID_DIMENSION);
	writeDimensionsValueProtoToStream(hashableKey.getDimensionsValue(), protoOutput);
	protoOutput->end(dimensionToken);

	// Then fill bucket_info (GaugeBucketInfo).
	for (const auto& bucket : pair.second) {
	long long bucketInfoToken = protoOutput->start(
	FIELD_TYPE_MESSAGE \| FIELD_COUNT_REPEATED \| FIELD_ID_BUCKET_INFO);
	protoOutput->write(FIELD_TYPE_INT64 \| FIELD_ID_START_BUCKET_NANOS,
	(long long)bucket.mBucketStartNs);
	protoOutput->write(FIELD_TYPE_INT64 \| FIELD_ID_END_BUCKET_NANOS,
	(long long)bucket.mBucketEndNs);
	long long atomToken = protoOutput->start(FIELD_TYPE_MESSAGE \| FIELD_ID_ATOM);
	writeFieldValueTreeToStream(*bucket.mGaugeFields, protoOutput);
	protoOutput->end(atomToken);
	protoOutput->end(bucketInfoToken);
	VLOG("\t bucket [%lld - %lld] includes %d gauge fields.", (long long)bucket.mBucketStartNs,
	(long long)bucket.mBucketEndNs, (int)bucket.mGaugeFields->size());
	}
	protoOutput->end(wrapperToken);
	}
	protoOutput->end(protoToken);
	protoOutput->write(FIELD_TYPE_INT64 \| FIELD_ID_END_REPORT_NANOS, (long long)dumpTimeNs);

	mPastBuckets.clear();
	mStartTimeNs = mCurrentBucketStartTimeNs;
	// TODO: Clear mDimensionKeyMap once the report is dumped.
	}

	void GaugeMetricProducer::onConditionChangedLocked(const bool conditionMet,
	const uint64_t eventTime) {
	VLOG("Metric %s onConditionChanged", mName.c_str());
	flushIfNeededLocked(eventTime);
	mCondition = conditionMet;

	// Push mode. No need to proactively pull the gauge data.
	if (mPullTagId == -1) {
	return;
	}
	// No need to pull again. Either scheduled pull or condition on true happened
	if (!mCondition) {
	return;
	}
	// Already have gauge metric for the current bucket, do not do it again.
	if (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) {
	onMatchedLogEventLocked(0, *data);
	}
	flushIfNeededLocked(eventTime);
	}

	void GaugeMetricProducer::onSlicedConditionMayChangeLocked(const uint64_t eventTime) {
	VLOG("Metric %s onSlicedConditionMayChange", mName.c_str());
	}

	std::shared_ptr<FieldValueMap> GaugeMetricProducer::getGaugeFields(const LogEvent& event) {
	std::shared_ptr<FieldValueMap> gaugeFields =
	std::make_shared<FieldValueMap>(event.getFieldValueMap());
	if (!mFieldFilter.include_all()) {
	filterFields(mFieldFilter.fields(), gaugeFields.get());
	}
	return gaugeFields;
	}

	void GaugeMetricProducer::onDataPulled(const std::vector<std::shared_ptr<LogEvent>>& allData) {
	std::lock_guard<std::mutex> lock(mMutex);
	if (allData.size() == 0) {
	return;
	}
	for (const auto& data : allData) {
	onMatchedLogEventLocked(0, *data);
	}
	}

	bool GaugeMetricProducer::hitGuardRailLocked(const HashableDimensionKey& newKey) {
	if (mCurrentSlicedBucket->find(newKey) != mCurrentSlicedBucket->end()) {
	return false;
	}
	// 1. Report the tuple count if the tuple count > soft limit
	if (mCurrentSlicedBucket->size() > StatsdStats::kDimensionKeySizeSoftLimit - 1) {
	size_t newTupleCount = mCurrentSlicedBucket->size() + 1;
	StatsdStats::getInstance().noteMetricDimensionSize(mConfigKey, mName, newTupleCount);
	// 2. Don't add more tuples, we are above the allowed threshold. Drop the data.
	if (newTupleCount > StatsdStats::kDimensionKeySizeHardLimit) {
	ALOGE("GaugeMetric %s dropping data for dimension key %s", mName.c_str(),
	newKey.c_str());
	return true;
	}
	}

	return false;
	}

	void GaugeMetricProducer::onMatchedLogEventInternalLocked(
	const size_t matcherIndex, const HashableDimensionKey& eventKey,
	const ConditionKey& conditionKey, bool condition,
	const LogEvent& event) {
	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;
	}
	flushIfNeededLocked(eventTimeNs);

	// For gauge metric, we just simply use the first gauge in the given bucket.
	if (mCurrentSlicedBucket->find(eventKey) != mCurrentSlicedBucket->end()) {
	return;
	}
	std::shared_ptr<FieldValueMap> gaugeFields = getGaugeFields(event);
	if (hitGuardRailLocked(eventKey)) {
	return;
	}
	(*mCurrentSlicedBucket)[eventKey] = gaugeFields;
	// Anomaly detection on gauge metric only works when there is one numeric
	// field specified.
	if (mAnomalyTrackers.size() > 0) {
	if (gaugeFields->size() == 1) {
	const DimensionsValue& dimensionsValue = gaugeFields->begin()->second;
	long gaugeVal = 0;
	if (dimensionsValue.has_value_int()) {
	gaugeVal = (long)dimensionsValue.value_int();
	} else if (dimensionsValue.has_value_long()) {
	gaugeVal = dimensionsValue.value_long();
	}
	for (auto& tracker : mAnomalyTrackers) {
	tracker->detectAndDeclareAnomaly(eventTimeNs, mCurrentBucketNum, eventKey,
	gaugeVal);
	}
	}
	}
	}

	void GaugeMetricProducer::updateCurrentSlicedBucketForAnomaly() {
	mCurrentSlicedBucketForAnomaly->clear();
	status_t err = NO_ERROR;
	for (const auto& slice : *mCurrentSlicedBucket) {
	const DimensionsValue& dimensionsValue = slice.second->begin()->second;
	long gaugeVal = 0;
	if (dimensionsValue.has_value_int()) {
	gaugeVal = (long)dimensionsValue.value_int();
	} else if (dimensionsValue.has_value_long()) {
	gaugeVal = dimensionsValue.value_long();
	}
	(*mCurrentSlicedBucketForAnomaly)[slice.first] = gaugeVal;
	}
	}

	// 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::flushIfNeededLocked(const uint64_t& eventTimeNs) {
	if (eventTimeNs < mCurrentBucketStartTimeNs + mBucketSizeNs) {
	VLOG("eventTime is %lld, less than next bucket start time %lld", (long long)eventTimeNs,
	(long long)(mCurrentBucketStartTimeNs + mBucketSizeNs));
	return;
	}

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

	for (const auto& slice : *mCurrentSlicedBucket) {
	info.mGaugeFields = slice.second;
	auto& bucketList = mPastBuckets[slice.first];
	bucketList.push_back(info);
	VLOG("gauge metric %s, dump key value: %s", mName.c_str(), slice.first.c_str());
	}

	// Reset counters
	if (mAnomalyTrackers.size() > 0) {
	updateCurrentSlicedBucketForAnomaly();
	for (auto& tracker : mAnomalyTrackers) {
	tracker->addPastBucket(mCurrentSlicedBucketForAnomaly, mCurrentBucketNum);
	}
	}

	mCurrentSlicedBucket = std::make_shared<DimToGaugeFieldsMap>();

	// Adjusts the bucket start time
	int64_t numBucketsForward = (eventTimeNs - mCurrentBucketStartTimeNs) / mBucketSizeNs;
	mCurrentBucketStartTimeNs = mCurrentBucketStartTimeNs + numBucketsForward * mBucketSizeNs;
	mCurrentBucketNum += numBucketsForward;
	VLOG("metric %s: new bucket start time: %lld", mName.c_str(),
	(long long)mCurrentBucketStartTimeNs);
	}

	size_t GaugeMetricProducer::byteSizeLocked() const {
	size_t totalSize = 0;
	for (const auto& pair : mPastBuckets) {
	totalSize += pair.second.size() * kBucketSize;
	}
	return totalSize;
	}

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