[METRICS] 討論 MetricFetcher 拉取特定 metrics

[chinghongfang]

Related to #1615 (comment)

localReceiver 將所有目標的 metric 拉下來 -> 過濾 -> 儲存。
然而，當 kafka cluster 內有許多 partition 時，metric 的數量也會增大。(數量大約是 2000 partition broker 大約要拉 20615 metric， 0 partition broker 大約要拉 614 metrics)

所以，若是只拉取需要的 metric 將有機會大大降低 "metric 拉下來" 的時間。
數量的來源主要是 partition level 的 metric，所以我認為把可以剔除不必要的 "partition level metric" 就好。

這裡討論有哪些 metric 是需要拉取的，我先列出 NetworkCost 會用到的 metric ，以及所有 metric 的數量級，供大家參考。

NetworkCost

Name	Type	Number of beans
Size	Log	2001
ReplicasCount	Partition	2000
null	Memory	1
ClusterId	KafkaServer	1

All metrics

Name	Type	Number of beans
NumLogSegments	Log	2001
LogEndOffset	Log	2001
LogStartOffset	Log	2001
Size	Log	2001
LastStableOffsetLag	Partition	2000
InSyncReplicasCount	Partition	2000
AtMinIsr	Partition	2000
ReplicasCount	Partition	2000
UnderReplicated	Partition	2000
UnderMinIsr	Partition	2000
TotalTimeMs	RequestMetrics	51
ResponseSendTimeMs	RequestMetrics	51
RequestBytes	RequestMetrics	51
RequestQueueTimeMs	RequestMetrics	51
RemoteTimeMs	RequestMetrics	51
ResponseQueueTimeMs	RequestMetrics	51
LocalTimeMs	RequestMetrics	51
ThrottleTimeMs	RequestMetrics	51
null	socket-server-metrics	34
ResponseQueueSize	RequestChannel	9
IdlePercent	Processor	8
RequestsPerSec	RequestMetrics	7
NumDelayedOperations	DelayedOperationPurgatory	7
PurgatorySize	DelayedOperationPurgatory	7
ErrorsPerSec	RequestMetrics	6
uncleanable-bytes	LogCleanerManager	2
uncleanable-partitions-count	LogCleanerManager	2
null	app-info	2
TemporaryMemoryBytes	RequestMetrics	2
LogDirectoryOffline	LogManager	2
MessageConversionsTimeMs	RequestMetrics	2
ReplicationBytesOutPerSec	BrokerTopicMetrics	1
OfflineReplicaCount	ReplicaManager	1
G1 Survivor Space	MemoryPool	1
ReassignmentBytesInPerSec	BrokerTopicMetrics	1
max-compaction-delay-secs	LogCleaner	1
linux-disk-write-bytes	KafkaServer	1
CodeCacheManager	MemoryManager	1
PartitionCount	ReplicaManager	1
ReassigningPartitions	ReplicaManager	1
UnderMinIsrPartitionCount	ReplicaManager	1
DeadThreadCount	ReplicaAlterLogDirsManager	1
ProduceMessageConversionsPerSec	BrokerTopicMetrics	1
NumGroupsEmpty	GroupMetadataManager	1
null	heartbeat-metrics	1
LeaderCount	ReplicaManager	1
AtMinIsrPartitionCount	ReplicaManager	1
G1 Old Gen	MemoryPool	1
ExpiredConnectionsKilledCount	SocketServer	1
max-clean-time-secs	LogCleaner	1
CodeHeap 'profiled nmethods'	MemoryPool	1
null	Threading	1
NumGroupsStable	GroupMetadataManager	1
null	forwarding-metrics	1
null	ControllerMutation	1
Metaspace Manager	MemoryManager	1
null	raft-channel-metrics	1
NumGroupsCompletingRebalance	GroupMetadataManager	1
null	Memory	1
mapped	BufferPool	1
max-buffer-utilization-percent	LogCleaner	1
NumIncrementalFetchPartitionsCached	FetchSessionCache	1
ReplicationBytesInPerSec	BrokerTopicMetrics	1
null	kafka.Log4jController	1
MetadataBatchProcessingTimeUs	BrokerMetadataListener	1
DeadThreadCount	ReplicaFetcherManager	1
NetworkProcessorAvgIdlePercent	SocketServer	1
cleaner-io	Throttler	1
time-since-last-run-ms	LogCleanerManager	1
FetchMessageConversionsPerSec	BrokerTopicMetrics	1
null	HotSpotDiagnostic	1
ClusterId	KafkaServer	1
TotalFetchRequestsPerSec	BrokerTopicMetrics	1
MaxLag	ReplicaAlterLogDirsManager	1
MaxLag	ReplicaFetcherManager	1
null	group-coordinator-metrics	1
G1 Eden Space	MemoryPool	1
null	raft-metrics	1
IsrExpandsPerSec	ReplicaManager	1
RequestQueueSize	RequestChannel	1
ReassignmentBytesOutPerSec	BrokerTopicMetrics	1
MinFetchRate	ReplicaFetcherManager	1
UnknownDestinationQueueSize	TransactionMarkerChannelManager	1
null	txn-marker-channel-metrics	1
OfflineLogDirectoryCount	LogManager	1
CodeHeap 'non-profiled nmethods'	MemoryPool	1
Metaspace	MemoryPool	1
AcceptorBlockedPercent	Acceptor	1
null	Produce	1
null	transaction-coordinator-metrics	1
DeadThreadCount	LogCleaner	1
FailedFetchRequestsPerSec	BrokerTopicMetrics	1
NoKeyCompactedTopicRecordsPerSec	BrokerTopicMetrics	1
null	FlightRecorder	1
MemoryPoolUsed	SocketServer	1
null	broker-metadata-metrics	1
null	ClassLoading	1
LogAppendRetryQueueSize	TransactionMarkerChannelManager	1
direct	BufferPool	1
BytesInPerSec	BrokerTopicMetrics	1
null	Runtime	1
TotalProduceRequestsPerSec	BrokerTopicMetrics	1
NumGroups	GroupMetadataManager	1
NumIncrementalFetchSessions	FetchSessionCache	1
max-dirty-percent	LogCleanerManager	1
FailedPartitionsCount	ReplicaAlterLogDirsManager	1
G1 Young Generation	GarbageCollector	1
Compressed Class Space	MemoryPool	1
G1 Old Generation	GarbageCollector	1
null	Compilation	1
null	Request	1
MemoryPoolAvailable	SocketServer	1
InvalidOffsetOrSequenceRecordsPerSec	BrokerTopicMetrics	1
FailedPartitionsCount	ReplicaFetcherManager	1
BytesRejectedPerSec	BrokerTopicMetrics	1
NumGroupsDead	GroupMetadataManager	1
LogFlushRateAndTimeMs	LogFlushStats	1
MetadataBatchSizes	BrokerMetadataListener	1
null	DiagnosticCommand	1
FailedProduceRequestsPerSec	BrokerTopicMetrics	1
NumOffsets	GroupMetadataManager	1
null	MBeanServerDelegate	1
InvalidMessageCrcRecordsPerSec	BrokerTopicMetrics	1
IncrementalFetchSessionEvictionsPerSec	FetchSessionCache	1
null	kafka-metrics-count	1
yammer-metrics-count	KafkaServer	1
null	Fetch	1
null	Logging	1
cleaner-recopy-percent	LogCleaner	1
RequestHandlerAvgIdlePercent	KafkaRequestHandlerPool	1
MinFetchRate	ReplicaAlterLogDirsManager	1
BytesOutPerSec	BrokerTopicMetrics	1
PartitionsWithLateTransactionsCount	ReplicaManager	1
UnderReplicatedPartitions	ReplicaManager	1
null	alterPartition-metrics	1
InvalidMagicNumberRecordsPerSec	BrokerTopicMetrics	1
null	OperatingSystem	1
CodeHeap 'non-nmethods'	MemoryPool	1
BrokerState	KafkaServer	1
NumGroupsPreparingRebalance	GroupMetadataManager	1
MessagesInPerSec	BrokerTopicMetrics	1
IsrShrinksPerSec	ReplicaManager	1
linux-disk-read-bytes	KafkaServer	1
FailedIsrUpdatesPerSec	ReplicaManager	1

[chia7712]

@chinghongfang 感謝建議，#1622 有提一個類似的作法，目前我們先以拉取 built-in 會用到的 beans就好，妳覺得如何