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 "guardrail/StatsdStats.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::FIELD_TYPE_STRING;
 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_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 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 ConfigKey& key, const GaugeMetric& metric,
                                          const int conditionIndex,
                                          const sp<ConditionWizard>& wizard, const int pullTagId,
                                          const int64_t startTimeNs)
     : MetricProducer(key, startTimeNs, 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 %s created. bucket size %lld start_time: %lld", metric.name().c_str(),
          (long long)mBucketSizeNs, (long long)mStartTimeNs);
 }

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

 void GaugeMetricProducer::startNewProtoOutputStream(long long startTime) {
     mProto = std::make_unique<ProtoOutputStream>();
     mProto->write(FIELD_TYPE_STRING | FIELD_ID_NAME, mMetric.name());
     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 %s dump report now...", mMetric.name().c_str());

     // 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.
     flushIfNeeded(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_STRING | 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();

     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 %s onConditionChanged", mMetric.name().c_str());
     flushIfNeeded(eventTime);
     mCondition = conditionMet;

     // Push mode. No need to proactively pull the gauge data.
     if (mPullTagId == -1) {
         return;
     }
     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) {
         onMatchedLogEvent(0, *data, false /*scheduledPull*/);
     }
     flushIfNeeded(eventTime);
 }

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

 int64_t GaugeMetricProducer::getGauge(const LogEvent& event) {
     status_t err = NO_ERROR;
     int64_t 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);
     for (const auto& data : allData) {
         onMatchedLogEvent(0, *data, true /*scheduledPull*/);
     }
 }

 bool GaugeMetricProducer::hitGuardRail(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, mMetric.name(),
                                                            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", mMetric.name().c_str(),
                   newKey.c_str());
             return true;
         }
     }

     return false;
 }

 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;
     }

     // When the event happens in a new bucket, flush the old buckets.
     if (eventTimeNs >= mCurrentBucketStartTimeNs + mBucketSizeNs) {
         flushIfNeeded(eventTimeNs);
     }

     // For gauge metric, we just simply use the first gauge in the given bucket.
     if (!mCurrentSlicedBucket->empty()) {
         return;
     }
     const long gauge = getGauge(event);
     if (gauge >= 0) {
         if (hitGuardRail(eventKey)) {
             return;
         }
         (*mCurrentSlicedBucket)[eventKey] = gauge;
     }
     for (auto& tracker : mAnomalyTrackers) {
         tracker->detectAndDeclareAnomaly(eventTimeNs, mCurrentBucketNum, eventKey, gauge);
     }
 }

 // 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::flushIfNeeded(const uint64_t eventTimeNs) {
     if (eventTimeNs < mCurrentBucketStartTimeNs + mBucketSizeNs) {
         return;
     }

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

     for (const auto& slice : *mCurrentSlicedBucket) {
         info.mGauge = slice.second;
         auto& bucketList = mPastBuckets[slice.first];
         bucketList.push_back(info);
         VLOG("gauge metric %s, dump key value: %s -> %lld", mMetric.name().c_str(),
              slice.first.c_str(), (long long)slice.second);
     }

     // Reset counters
     for (auto& tracker : mAnomalyTrackers) {
         tracker->addPastBucket(mCurrentSlicedBucket, mCurrentBucketNum);
     }

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

     // 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", mMetric.name().c_str(),
          (long long)mCurrentBucketStartTimeNs);
 }

 size_t GaugeMetricProducer::byteSize() 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 true // STOPSHIP if true
	#include "Log.h"

	#include "GaugeMetricProducer.h"
	#include "guardrail/StatsdStats.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::FIELD_TYPE_STRING;
	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_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 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 ConfigKey& key, const GaugeMetric& metric,
	const int conditionIndex,
	const sp<ConditionWizard>& wizard, const int pullTagId,
	const int64_t startTimeNs)
	: MetricProducer(key, startTimeNs, 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 %s created. bucket size %lld start_time: %lld", metric.name().c_str(),
	(long long)mBucketSizeNs, (long long)mStartTimeNs);
	}

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

	void GaugeMetricProducer::startNewProtoOutputStream(long long startTime) {
	mProto = std::make_unique<ProtoOutputStream>();
	mProto->write(FIELD_TYPE_STRING \| FIELD_ID_NAME, mMetric.name());
	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 %s dump report now...", mMetric.name().c_str());

	// 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.
	flushIfNeeded(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_STRING \| 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();

	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 %s onConditionChanged", mMetric.name().c_str());
	flushIfNeeded(eventTime);
	mCondition = conditionMet;

	// Push mode. No need to proactively pull the gauge data.
	if (mPullTagId == -1) {
	return;
	}
	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) {
	onMatchedLogEvent(0, data, false /scheduledPull*/);
	}
	flushIfNeeded(eventTime);
	}

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

	int64_t GaugeMetricProducer::getGauge(const LogEvent& event) {
	status_t err = NO_ERROR;
	int64_t 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);
	for (const auto& data : allData) {
	onMatchedLogEvent(0, data, true /scheduledPull*/);
	}
	}

	bool GaugeMetricProducer::hitGuardRail(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, mMetric.name(),
	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", mMetric.name().c_str(),
	newKey.c_str());
	return true;
	}
	}

	return false;
	}

	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;
	}

	// When the event happens in a new bucket, flush the old buckets.
	if (eventTimeNs >= mCurrentBucketStartTimeNs + mBucketSizeNs) {
	flushIfNeeded(eventTimeNs);
	}

	// For gauge metric, we just simply use the first gauge in the given bucket.
	if (!mCurrentSlicedBucket->empty()) {
	return;
	}
	const long gauge = getGauge(event);
	if (gauge >= 0) {
	if (hitGuardRail(eventKey)) {
	return;
	}
	(*mCurrentSlicedBucket)[eventKey] = gauge;
	}
	for (auto& tracker : mAnomalyTrackers) {
	tracker->detectAndDeclareAnomaly(eventTimeNs, mCurrentBucketNum, eventKey, gauge);
	}
	}

	// 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::flushIfNeeded(const uint64_t eventTimeNs) {
	if (eventTimeNs < mCurrentBucketStartTimeNs + mBucketSizeNs) {
	return;
	}

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

	for (const auto& slice : *mCurrentSlicedBucket) {
	info.mGauge = slice.second;
	auto& bucketList = mPastBuckets[slice.first];
	bucketList.push_back(info);
	VLOG("gauge metric %s, dump key value: %s -> %lld", mMetric.name().c_str(),
	slice.first.c_str(), (long long)slice.second);
	}

	// Reset counters
	for (auto& tracker : mAnomalyTrackers) {
	tracker->addPastBucket(mCurrentSlicedBucket, mCurrentBucketNum);
	}

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

	// 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", mMetric.name().c_str(),
	(long long)mCurrentBucketStartTimeNs);
	}

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

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