metrics.go

package module

import (
	"time"

	"github.com/onflow/flow-go/model/cluster"
	"github.com/onflow/flow-go/model/flow"
)

type EntriesFunc func() uint

// ResolverMetrics encapsulates the metrics collectors for dns resolver module of the networking layer.
type ResolverMetrics interface {
	// DNSLookupDuration tracks the time spent to resolve a DNS address.
	DNSLookupDuration(duration time.Duration)

	// OnDNSCacheMiss tracks the total number of dns requests resolved through looking up the network.
	OnDNSCacheMiss()

	// DNSCacheResolution tracks the total number of dns requests resolved through the cache without
	// looking up the network.
	OnDNSCacheHit()

	// OnDNSCacheInvalidated is called whenever dns cache is invalidated for an entry
	OnDNSCacheInvalidated()

	// OnDNSLookupRequestDropped tracks the number of dns lookup requests that are dropped due to a full queue
	OnDNSLookupRequestDropped()
}

type NetworkMetrics interface {
	ResolverMetrics
	DHTMetrics

	// NetworkMessageSent size in bytes and count of the network message sent
	NetworkMessageSent(sizeBytes int, topic string, messageType string)

	// NetworkMessageReceived size in bytes and count of the network message received
	NetworkMessageReceived(sizeBytes int, topic string, messageType string)

	// NetworkDuplicateMessagesDropped counts number of messages dropped due to duplicate detection
	NetworkDuplicateMessagesDropped(topic string, messageType string)

	// Message receive queue metrics
	// MessageAdded increments the metric tracking the number of messages in the queue with the given priority
	MessageAdded(priority int)

	// MessageRemoved decrements the metric tracking the number of messages in the queue with the given priority
	MessageRemoved(priority int)

	// QueueDuration tracks the time spent by a message with the given priority in the queue
	QueueDuration(duration time.Duration, priority int)

	DirectMessageStarted(topic string)

	DirectMessageFinished(topic string)

	// MessageProcessingStarted tracks the start of a call to process a message from the given topic
	MessageProcessingStarted(topic string)

	// MessageProcessingFinished tracks the time a queue worker blocked by an engine for processing an incoming message on specified topic (i.e., channel).
	MessageProcessingFinished(topic string, duration time.Duration)

	// OutboundConnections updates the metric tracking the number of outbound connections of this node
	OutboundConnections(connectionCount uint)

	// InboundConnections updates the metric tracking the number of inbound connections of this node
	InboundConnections(connectionCount uint)
}

type EngineMetrics interface {
	MessageSent(engine string, message string)
	MessageReceived(engine string, message string)
	MessageHandled(engine string, messages string)
}

type ComplianceMetrics interface {
	FinalizedHeight(height uint64)
	CommittedEpochFinalView(view uint64)
	SealedHeight(height uint64)
	BlockFinalized(*flow.Block)
	BlockSealed(*flow.Block)
	BlockProposalDuration(duration time.Duration)
	CurrentEpochCounter(counter uint64)
	CurrentEpochPhase(phase flow.EpochPhase)
	CurrentEpochFinalView(view uint64)
	CurrentDKGPhase1FinalView(view uint64)
	CurrentDKGPhase2FinalView(view uint64)
	CurrentDKGPhase3FinalView(view uint64)
	EpochEmergencyFallbackTriggered()
}

type CleanerMetrics interface {
	RanGC(took time.Duration)
}

type CacheMetrics interface {
	// CacheEntries report the total number of cached items
	CacheEntries(resource string, entries uint)
	// CacheHit report the number of times the queried item is found in the cache
	CacheHit(resource string)
	// CacheNotFound records the number of times the queried item was not found in either cache or database.
	CacheNotFound(resource string)
	// CacheMiss report the number of times the queried item is not found in the cache, but found in the database.
	CacheMiss(resource string)
}

type MempoolMetrics interface {
	MempoolEntries(resource string, entries uint)
	Register(resource string, entriesFunc EntriesFunc) error
}

type HotstuffMetrics interface {
	// HotStuffBusyDuration reports Metrics C6 HotStuff Busy Duration
	HotStuffBusyDuration(duration time.Duration, event string)

	// HotStuffIdleDuration reports Metrics C6 HotStuff Idle Duration
	HotStuffIdleDuration(duration time.Duration)

	// HotStuffWaitDuration reports Metrics C6 HotStuff Idle Duration
	HotStuffWaitDuration(duration time.Duration, event string)

	// SetCurView reports Metrics C8: Current View
	SetCurView(view uint64)

	// SetQCView reports Metrics C9: View of Newest Known QC
	SetQCView(view uint64)

	// CountSkipped reports the number of times we skipped ahead.
	CountSkipped()

	// CountTimeout reports the number of times we timed out.
	CountTimeout()

	// SetTimeout sets the current timeout duration
	SetTimeout(duration time.Duration)

	// CommitteeProcessingDuration measures the time which the HotStuff's core logic
	// spends in the hotstuff.Committee component, i.e. the time determining consensus
	// committee relations.
	CommitteeProcessingDuration(duration time.Duration)

	// SignerProcessingDuration measures the time which the HotStuff's core logic
	// spends in the hotstuff.Signer component, i.e. the with crypto-related operations.
	SignerProcessingDuration(duration time.Duration)

	// ValidatorProcessingDuration measures the time which the HotStuff's core logic
	// spends in the hotstuff.Validator component, i.e. the with verifying
	// consensus messages.
	ValidatorProcessingDuration(duration time.Duration)

	// PayloadProductionDuration measures the time which the HotStuff's core logic
	// spends in the module.Builder component, i.e. the with generating block payloads.
	PayloadProductionDuration(duration time.Duration)
}

type CollectionMetrics interface {
	// TransactionIngested is called when a new transaction is ingested by the
	// node. It increments the total count of ingested transactions and starts
	// a tx->col span for the transaction.
	TransactionIngested(txID flow.Identifier)

	// ClusterBlockProposed is called when a new collection is proposed by us or
	// any other node in the cluster.
	ClusterBlockProposed(block *cluster.Block)

	// ClusterBlockFinalized is called when a collection is finalized.
	ClusterBlockFinalized(block *cluster.Block)
}

type ConsensusMetrics interface {
	// StartCollectionToFinalized reports Metrics C1: Collection Received by CCL→ Collection Included in Finalized Block
	StartCollectionToFinalized(collectionID flow.Identifier)

	// FinishCollectionToFinalized reports Metrics C1: Collection Received by CCL→ Collection Included in Finalized Block
	FinishCollectionToFinalized(collectionID flow.Identifier)

	// StartBlockToSeal reports Metrics C4: Block Received by CCL → Block Seal in finalized block
	StartBlockToSeal(blockID flow.Identifier)

	// FinishBlockToSeal reports Metrics C4: Block Received by CCL → Block Seal in finalized block
	FinishBlockToSeal(blockID flow.Identifier)

	// EmergencySeal increments the number of seals that were created in emergency mode
	EmergencySeal()

	// OnReceiptProcessingDuration records the number of seconds spent processing a receipt
	OnReceiptProcessingDuration(duration time.Duration)

	// OnApprovalProcessingDuration records the number of seconds spent processing an approval
	OnApprovalProcessingDuration(duration time.Duration)

	// CheckSealingDuration records absolute time for the full sealing check by the consensus match engine
	CheckSealingDuration(duration time.Duration)
}

type VerificationMetrics interface {
	// OnBlockConsumerJobDone is invoked by block consumer whenever it is notified a job is done by a worker. It
	// sets the last processed block job index.
	OnBlockConsumerJobDone(uint64)
	// OnChunkConsumerJobDone is invoked by chunk consumer whenever it is notified a job is done by a worker. It
	// sets the last processed chunk job index.
	OnChunkConsumerJobDone(uint64)
	// OnExecutionResultReceivedAtAssignerEngine is called whenever a new execution result arrives
	// at Assigner engine. It increments total number of received execution results.
	OnExecutionResultReceivedAtAssignerEngine()

	// OnVerifiableChunkReceivedAtVerifierEngine increments a counter that keeps track of number of verifiable chunks received at
	// verifier engine from fetcher engine.
	OnVerifiableChunkReceivedAtVerifierEngine()

	// OnFinalizedBlockArrivedAtAssigner sets a gauge that keeps track of number of the latest block height arrives
	// at assigner engine. Note that it assumes blocks are coming to assigner engine in strictly increasing order of their height.
	OnFinalizedBlockArrivedAtAssigner(height uint64)

	// OnChunksAssignmentDoneAtAssigner increments a counter that keeps track of the total number of assigned chunks to
	// the verification node.
	OnChunksAssignmentDoneAtAssigner(chunks int)

	// OnAssignedChunkProcessedAtAssigner increments a counter that keeps track of the total number of assigned chunks pushed by
	// assigner engine to the fetcher engine.
	OnAssignedChunkProcessedAtAssigner()

	// OnAssignedChunkReceivedAtFetcher increments a counter that keeps track of number of assigned chunks arrive at fetcher engine.
	OnAssignedChunkReceivedAtFetcher()

	// OnChunkDataPackRequestSentByFetcher increments a counter that keeps track of number of chunk data pack requests that fetcher engine
	// sends to requester engine.
	OnChunkDataPackRequestSentByFetcher()

	// OnChunkDataPackRequestReceivedByRequester increments a counter that keeps track of number of chunk data pack requests
	// arrive at the requester engine from the fetcher engine.
	OnChunkDataPackRequestReceivedByRequester()

	// OnChunkDataPackRequestDispatchedInNetwork increments a counter that keeps track of number of chunk data pack requests that the
	// requester engine dispatches in the network (to the execution nodes).
	OnChunkDataPackRequestDispatchedInNetworkByRequester()

	// OnChunkDataPackResponseReceivedFromNetwork increments a counter that keeps track of number of chunk data pack responses that the
	// requester engine receives from execution nodes (through network).
	OnChunkDataPackResponseReceivedFromNetworkByRequester()

	// SetMaxChunkDataPackAttemptsForNextUnsealedHeightAtRequester is invoked when a cycle of requesting chunk data packs is done by requester engine.
	// It updates the maximum number of attempts made by requester engine for requesting the chunk data packs of the next unsealed height.
	// The maximum is taken over the history of all chunk data packs requested during that cycle that belong to the next unsealed height.
	SetMaxChunkDataPackAttemptsForNextUnsealedHeightAtRequester(attempts uint64)

	// OnChunkDataPackSentToFetcher increments a counter that keeps track of number of chunk data packs sent to the fetcher engine from
	// requester engine.
	OnChunkDataPackSentToFetcher()

	// OnChunkDataPackArrivedAtFetcher increments a counter that keeps track of number of chunk data packs arrived at fetcher engine from
	// requester engine.
	OnChunkDataPackArrivedAtFetcher()

	// OnVerifiableChunkSentToVerifier increments a counter that keeps track of number of verifiable chunks fetcher engine sent to verifier engine.
	OnVerifiableChunkSentToVerifier()

	// OnResultApprovalDispatchedInNetwork increments a counter that keeps track of number of result approvals dispatched in the network
	// by verifier engine.
	OnResultApprovalDispatchedInNetworkByVerifier()
}

// LedgerMetrics provides an interface to record Ledger Storage metrics.
// Ledger storage is non-linear (fork-aware) so certain metrics are averaged
// and computed before emitting for better visibility
type LedgerMetrics interface {
	// ForestApproxMemorySize records approximate memory usage of forest (all in-memory trees)
	ForestApproxMemorySize(bytes uint64)

	// ForestNumberOfTrees current number of trees in a forest (in memory)
	ForestNumberOfTrees(number uint64)

	// LatestTrieRegCount records the number of unique register allocated (the latest created trie)
	LatestTrieRegCount(number uint64)

	// LatestTrieRegCountDiff records the difference between the number of unique register allocated of the latest created trie and parent trie
	LatestTrieRegCountDiff(number int64)

	// LatestTrieRegSize records the size of unique register allocated (the latest created trie)
	LatestTrieRegSize(size uint64)

	// LatestTrieRegSizeDiff records the difference between the size of unique register allocated of the latest created trie and parent trie
	LatestTrieRegSizeDiff(size int64)

	// LatestTrieMaxDepthTouched records the maximum depth touched of the lastest created trie
	LatestTrieMaxDepthTouched(maxDepth uint16)

	// UpdateCount increase a counter of performed updates
	UpdateCount()

	// ProofSize records a proof size
	ProofSize(bytes uint32)

	// UpdateValuesNumber accumulates number of updated values
	UpdateValuesNumber(number uint64)

	// UpdateValuesSize total size (in bytes) of updates values
	UpdateValuesSize(byte uint64)

	// UpdateDuration records absolute time for the update of a trie
	UpdateDuration(duration time.Duration)

	// UpdateDurationPerItem records update time for single value (total duration / number of updated values)
	UpdateDurationPerItem(duration time.Duration)

	// ReadValuesNumber accumulates number of read values
	ReadValuesNumber(number uint64)

	// ReadValuesSize total size (in bytes) of read values
	ReadValuesSize(byte uint64)

	// ReadDuration records absolute time for the read from a trie
	ReadDuration(duration time.Duration)

	// ReadDurationPerItem records read time for single value (total duration / number of read values)
	ReadDurationPerItem(duration time.Duration)
}

type WALMetrics interface {
	// DiskSize records the amount of disk space used by the storage (in bytes)
	DiskSize(uint64)
}

type ExecutionDataServiceMetrics interface {
	ExecutionDataAddStarted()

	ExecutionDataAddFinished(duration time.Duration, success bool, blobTreeSize uint64)

	ExecutionDataGetStarted()

	ExecutionDataGetFinished(duration time.Duration, success bool, blobTreeSize uint64)
}

type ExecutionDataRequesterMetrics interface {
	// ExecutionDataFetchStarted records an in-progress download
	ExecutionDataFetchStarted()

	// ExecutionDataFetchFinished records a completed download
	ExecutionDataFetchFinished(duration time.Duration, success bool, height uint64)

	// NotificationSent reports that ExecutionData received notifications were sent for a block height
	NotificationSent(height uint64)

	// FetchRetried reports that a download retry was processed
	FetchRetried()
}

type RuntimeMetrics interface {
	// TransactionParsed reports the time spent parsing a single transaction
	RuntimeTransactionParsed(dur time.Duration)

	// TransactionChecked reports the time spent checking a single transaction
	RuntimeTransactionChecked(dur time.Duration)

	// TransactionInterpreted reports the time spent interpreting a single transaction
	RuntimeTransactionInterpreted(dur time.Duration)

	// RuntimeSetNumberOfAccounts Sets the total number of accounts on the network
	RuntimeSetNumberOfAccounts(count uint64)
}

type ProviderMetrics interface {
	// ChunkDataPackRequested is executed every time a chunk data pack request is arrived at execution node.
	// It increases the request counter by one.
	ChunkDataPackRequested()
}

type AccessMetrics interface {
	// TotalConnectionsInPool updates the number connections to collection/execution nodes stored in the pool, and the size of the pool
	TotalConnectionsInPool(connectionCount uint, connectionPoolSize uint)

	// ConnectionFromPoolRetrieved tracks the number of times a connection to a collection/execution node is retrieved from the connection pool
	ConnectionFromPoolRetrieved()
}

type ExecutionMetrics interface {
	LedgerMetrics
	RuntimeMetrics
	ProviderMetrics
	WALMetrics

	// StartBlockReceivedToExecuted starts a span to trace the duration of a block
	// from being received for execution to execution being finished
	StartBlockReceivedToExecuted(blockID flow.Identifier)

	// FinishBlockReceivedToExecuted finishes a span to trace the duration of a block
	// from being received for execution to execution being finished
	FinishBlockReceivedToExecuted(blockID flow.Identifier)

	// ExecutionStateReadsPerBlock reports number of state access/read operations per block
	ExecutionStateReadsPerBlock(reads uint64)

	// ExecutionStorageStateCommitment reports the storage size of a state commitment in bytes
	ExecutionStorageStateCommitment(bytes int64)

	// ExecutionLastExecutedBlockHeight reports last executed block height
	ExecutionLastExecutedBlockHeight(height uint64)

	// ExecutionBlockExecuted reports the total time and computation spent on executing a block
	ExecutionBlockExecuted(dur time.Duration, compUsed uint64, txCounts int, colCounts int)

	// ExecutionCollectionExecuted reports the total time and computation spent on executing a collection
	ExecutionCollectionExecuted(dur time.Duration, compUsed uint64, txCounts int)

	// ExecutionTransactionExecuted reports the total time, computation and memory spent on executing a single transaction
	ExecutionTransactionExecuted(dur time.Duration, compUsed, memoryUsed, memoryEstimate uint64, eventCounts int, failed bool)

	// ExecutionScriptExecuted reports the time and memory spent on executing an script
	ExecutionScriptExecuted(dur time.Duration, compUsed, memoryUsed, memoryEstimate uint64)

	// ExecutionCollectionRequestSent reports when a request for a collection is sent to a collection node
	ExecutionCollectionRequestSent()

	// Unused
	ExecutionCollectionRequestRetried()

	// ExecutionSync reports when the state syncing is triggered or stopped.
	ExecutionSync(syncing bool)

	ExecutionBlockDataUploadStarted()

	ExecutionBlockDataUploadFinished(dur time.Duration)
}

type BackendScriptsMetrics interface {
	// Record the round trip time while executing a script
	ScriptExecuted(dur time.Duration, size int)
}

type TransactionMetrics interface {
	BackendScriptsMetrics

	// Record the round trip time while getting a transaction result
	TransactionResultFetched(dur time.Duration, size int)

	// TransactionReceived starts tracking of transaction execution/finalization/sealing
	TransactionReceived(txID flow.Identifier, when time.Time)

	// TransactionFinalized reports the time spent between the transaction being received and finalized. Reporting only
	// works if the transaction was earlier added as received.
	TransactionFinalized(txID flow.Identifier, when time.Time)

	// TransactionExecuted reports the time spent between the transaction being received and executed. Reporting only
	// works if the transaction was earlier added as received.
	TransactionExecuted(txID flow.Identifier, when time.Time)

	// TransactionExpired tracks number of expired transactions
	TransactionExpired(txID flow.Identifier)

	// TransactionSubmissionFailed should be called whenever we try to submit a transaction and it fails
	TransactionSubmissionFailed()
}

type PingMetrics interface {
	// NodeReachable tracks the round trip time in milliseconds taken to ping a node
	// The nodeInfo provides additional information about the node such as the name of the node operator
	NodeReachable(node *flow.Identity, nodeInfo string, rtt time.Duration)

	// NodeInfo tracks the software version, sealed height and hotstuff view of a node
	NodeInfo(node *flow.Identity, nodeInfo string, version string, sealedHeight uint64, hotstuffCurView uint64)
}

type HeroCacheMetrics interface {
	// BucketAvailableSlots keeps track of number of available slots in buckets of cache.
	BucketAvailableSlots(uint64, uint64)

	// OnKeyPutSuccess is called whenever a new (key, entity) pair is successfully added to the cache.
	OnKeyPutSuccess()

	// OnKeyPutFailure is tracking the total number of unsuccessful writes caused by adding a duplicate key to the cache.
	// A duplicate key is dropped by the cache when it is written to the cache.
	// Note: in context of HeroCache, the key corresponds to the identifier of its entity. Hence, a duplicate key corresponds to
	// a duplicate entity.
	OnKeyPutFailure()

	// OnKeyGetSuccess tracks total number of successful read queries.
	// A read query is successful if the entity corresponding to its key is available in the cache.
	// Note: in context of HeroCache, the key corresponds to the identifier of its entity.
	OnKeyGetSuccess()

	// OnKeyGetFailure tracks total number of unsuccessful read queries.
	// A read query is unsuccessful if the entity corresponding to its key is not available in the cache.
	// Note: in context of HeroCache, the key corresponds to the identifier of its entity.
	OnKeyGetFailure()

	// OnEntityEjectionDueToFullCapacity is called whenever adding a new (key, entity) to the cache results in ejection of another (key', entity') pair.
	// This normally happens -- and is expected -- when the cache is full.
	// Note: in context of HeroCache, the key corresponds to the identifier of its entity.
	OnEntityEjectionDueToFullCapacity()

	// OnEntityEjectionDueToEmergency is called whenever a bucket is found full and all of its keys are valid, i.e.,
	// each key belongs to an existing (key, entity) pair.
	// Hence, adding a new key to that bucket will replace the oldest valid key inside that bucket.
	// Note: in context of HeroCache, the key corresponds to the identifier of its entity.
	OnEntityEjectionDueToEmergency()
}

type DHTMetrics interface {
	RoutingTablePeerAdded()
	RoutingTablePeerRemoved()
}