[metrics] add block analyzer queuelength metrics

analyzer/block/block.go

@@ -17,6 +17,7 @@ import (
 	"github.com/oasisprotocol/nexus/analyzer/util"
 	"github.com/oasisprotocol/nexus/config"
 	"github.com/oasisprotocol/nexus/log"
+	"github.com/oasisprotocol/nexus/metrics"
 	"github.com/oasisprotocol/nexus/storage"
 )
 
@@ -61,8 +62,9 @@ type blockBasedAnalyzer struct {
 
 	processor BlockProcessor
 
-	target storage.TargetStorage
-	logger *log.Logger
+	target  storage.TargetStorage
+	logger  *log.Logger
+	metrics metrics.AnalysisMetrics
 
 	slowSync bool
 }
@@ -259,6 +261,31 @@ func (b *blockBasedAnalyzer) ensureSlowSyncPrerequisites(ctx context.Context) (o
 	return true
 }
 
+// sendQueueLengthMetric updates the relevant Prometheus metric with an approximation
+// of the number of known blocks that require processing, calculated as the difference
+// between the analyzer's highest processed block and the current block height
+// on-chain (fetched by the node-stats analyzer).
+// Note that the true count may be higher during fast-sync.
+func (b *blockBasedAnalyzer) sendQueueLengthMetric(queueLength uint64) {
+	// For block-based analyzers, the analyzer name is identical to the layer name.
+	b.metrics.QueueLength(b.analyzerName).Set(float64(queueLength))
+}
+
+// Returns the chain height of the layer this analyzer is processing.
+// The heights are fetched and added to the database by the node-stats analyzer.
+func (b *blockBasedAnalyzer) nodeHeight(ctx context.Context) (int, error) {
+	var nodeHeight int
+	err := b.target.QueryRow(ctx, queries.NodeHeight, b.analyzerName).Scan(&nodeHeight)
+	switch err {
+	case nil:
+		return nodeHeight, nil
+	case pgx.ErrNoRows:
+		return -1, nil
+	default:
+		return -1, fmt.Errorf("error fetching chain height for consensus: %w", err)
+	}
+}
+
 // Start starts the block analyzer.
 func (b *blockBasedAnalyzer) Start(ctx context.Context) {
 	// Run prework.
@@ -325,6 +352,10 @@ func (b *blockBasedAnalyzer) Start(ctx context.Context) {
 			backoff.Failure()
 			continue
 		}
+		nodeHeight, err := b.nodeHeight(ctx)
+		if err != nil {
+			b.logger.Warn("error fetching current node height: %w", err)
+		}
 
 		// Process blocks.
 		b.logger.Debug("picked blocks for processing", "heights", heights)
@@ -337,6 +368,12 @@ func (b *blockBasedAnalyzer) Start(ctx context.Context) {
 			// in the batch will exceed the current lock expiry of 5min. The analyzer will terminate
 			// the batch early and attempt to refresh the locks for a new batch.
 			if b.slowSync {
+				// In slow-sync mode, we update the node-height at each block for a more
+				// precise measurement.
+				nodeHeight, err = b.nodeHeight(ctx)
+				if err != nil {
+					b.logger.Warn("error fetching current node height: %w", err)
+				}
 				select {
 				case <-time.After(backoff.Timeout()):
 					// Process the next block
@@ -379,6 +416,10 @@ func (b *blockBasedAnalyzer) Start(ctx context.Context) {
 				b.unlockBlocks(ctx, []uint64{height})
 				continue
 			}
+			// If we successfully fetched the node height earlier, update the estimated queue length.
+			if nodeHeight != -1 {
+				b.sendQueueLengthMetric(uint64(nodeHeight) - height)
+			}
 			cancel()
 			backoff.Success()
 			b.logger.Info("processed block", "height", height)
@@ -425,13 +466,16 @@ func NewAnalyzer(
 	if batchSize == 0 {
 		batchSize = defaultBatchSize
 	}
-	return &blockBasedAnalyzer{
+	a := &blockBasedAnalyzer{
 		blockRange:   blockRange,
 		batchSize:    batchSize,
 		analyzerName: name,
 		processor:    processor,
 		target:       target,
 		logger:       logger.With("analyzer", name, "mode", mode),
+		metrics:      metrics.NewDefaultAnalysisMetrics(name),
 		slowSync:     mode == analyzer.SlowSyncMode,
-	}, nil
+	}
+
+	return a, nil
 }

analyzer/block/block_test.go

@@ -112,7 +112,7 @@ func setupAnalyzer(t *testing.T, testDb *postgres.Client, p *mockProcessor, cfg
 	p.isFastSync = (mode == analyzer.FastSyncMode)
 
 	// Initialize the block analyzer.
-	logger, err := log.NewLogger(fmt.Sprintf("test-analyzer-%s", p.name), os.Stdout, log.FmtJSON, log.LevelInfo)
+	logger, err := log.NewLogger(fmt.Sprintf("test_analyzer-%s", p.name), os.Stdout, log.FmtJSON, log.LevelInfo)
 	require.NoError(t, err, "log.NewLogger")
 	var blockRange config.BlockRange
 	switch mode {
@@ -152,7 +152,7 @@ func TestFastSyncBlockAnalyzer(t *testing.T) {
 	ctx := context.Background()
 
 	db := setupDB(t)
-	p := &mockProcessor{name: "test-analyzer", storage: db}
+	p := &mockProcessor{name: "test_analyzer", storage: db}
 	analyzer := setupAnalyzer(t, db, p, testBlockBasedConfig, analyzer.SlowSyncMode)
 
 	// Run the analyzer and ensure all blocks are processed.
@@ -188,7 +188,7 @@ func TestMultipleFastSyncBlockAnalyzers(t *testing.T) {
 	ps := []*mockProcessor{}
 	as := []analyzer.Analyzer{}
 	for i := 0; i < numAnalyzers; i++ {
-		p := &mockProcessor{name: "test-analyzer", storage: db}
+		p := &mockProcessor{name: "test_analyzer", storage: db}
 		analyzer := setupAnalyzer(t, db, p, testFastSyncBlockBasedConfig, analyzer.FastSyncMode)
 		ps = append(ps, p)
 		as = append(as, analyzer)
@@ -238,7 +238,7 @@ func TestFailingFastSyncBlockAnalyzers(t *testing.T) {
 				return fmt.Errorf("failing analyzer")
 			}
 		}
-		p := &mockProcessor{name: "test-analyzer", storage: db, fail: fail}
+		p := &mockProcessor{name: "test_analyzer", storage: db, fail: fail}
 		analyzer := setupAnalyzer(t, db, p, testFastSyncBlockBasedConfig, analyzer.FastSyncMode)
 		ps = append(ps, p)
 		as = append(as, analyzer)
@@ -281,7 +281,7 @@ func TestDistinctFastSyncBlockAnalyzers(t *testing.T) {
 	ps := []*mockProcessor{}
 	as := []analyzer.Analyzer{}
 	for i := 0; i < numAnalyzers; i++ {
-		p := &mockProcessor{name: fmt.Sprintf("test-analyzer-%d", i), storage: db}
+		p := &mockProcessor{name: fmt.Sprintf("test_analyzer_%d", i), storage: db}
 		analyzer := setupAnalyzer(t, db, p, testFastSyncBlockBasedConfig, analyzer.FastSyncMode)
 		ps = append(ps, p)
 		as = append(as, analyzer)
@@ -318,7 +318,7 @@ func TestSlowSyncBlockAnalyzer(t *testing.T) {
 	ctx := context.Background()
 
 	db := setupDB(t)
-	p := &mockProcessor{name: "test-analyzer", storage: db}
+	p := &mockProcessor{name: "test_analyzer", storage: db}
 	analyzer := setupAnalyzer(t, db, p, testBlockBasedConfig, analyzer.SlowSyncMode)
 
 	// Run the analyzer and ensure all blocks are processed.
@@ -351,7 +351,7 @@ func TestFailingSlowSyncBlockAnalyzer(t *testing.T) {
 	ctx := context.Background()
 
 	db := setupDB(t)
-	p := &mockProcessor{name: "test-analyzer", storage: db, fail: func(height uint64) error {
+	p := &mockProcessor{name: "test_analyzer", storage: db, fail: func(height uint64) error {
 		// Fail ~5% of the time.
 		if rand.Float64() > 0.95 { // /nolint:gosec // G404: Use of weak random number generator (math/rand instead of crypto/rand).
 			return fmt.Errorf("failed by chance")
@@ -394,7 +394,7 @@ func TestDistinctSlowSyncBlockAnalyzers(t *testing.T) {
 	ps := []*mockProcessor{}
 	as := []analyzer.Analyzer{}
 	for i := 0; i < numAnalyzers; i++ {
-		p := &mockProcessor{name: fmt.Sprintf("test-analyzer-%d", i), storage: db}
+		p := &mockProcessor{name: fmt.Sprintf("test_analyzer_%d", i), storage: db}
 		analyzer := setupAnalyzer(t, db, p, testBlockBasedConfig, analyzer.SlowSyncMode)
 		ps = append(ps, p)
 		as = append(as, analyzer)

analyzer/consensus/consensus.go

@@ -297,13 +297,13 @@ func (m *processor) ProcessBlock(ctx context.Context, uheight uint64) error {
 	// Fetch all data.
 	fetchTimer := m.metrics.BlockFetchLatencies()
 	data, err := fetchAllData(ctx, m.source, m.network, height, m.mode == analyzer.FastSyncMode)
+	fetchTimer.ObserveDuration()
 	if err != nil {
 		if strings.Contains(err.Error(), fmt.Sprintf("%d must be less than or equal to the current blockchain height", height)) {
 			return analyzer.ErrOutOfRange
 		}
 		return err
 	}
-	fetchTimer.ObserveDuration() // We make no observation in case of a data fetch error; those timings are misleading.
 
 	// Process data, prepare updates.
 	analysisTimer := m.metrics.BlockAnalysisLatencies()

analyzer/item/item.go

@@ -12,12 +12,11 @@ import (
 	"sync"
 	"time"
 
-	"github.com/prometheus/client_golang/prometheus"
-
 	"github.com/oasisprotocol/nexus/analyzer"
 	"github.com/oasisprotocol/nexus/analyzer/util"
 	"github.com/oasisprotocol/nexus/config"
 	"github.com/oasisprotocol/nexus/log"
+	"github.com/oasisprotocol/nexus/metrics"
 	"github.com/oasisprotocol/nexus/storage"
 )
 
@@ -41,9 +40,9 @@ type itemBasedAnalyzer[Item any] struct {
 
 	processor ItemProcessor[Item]
 
-	target            storage.TargetStorage
-	logger            *log.Logger
-	queueLengthMetric prometheus.Gauge
+	target  storage.TargetStorage
+	logger  *log.Logger
+	metrics metrics.AnalysisMetrics
 }
 
 var _ analyzer.Analyzer = (*itemBasedAnalyzer[any])(nil)
@@ -88,12 +87,8 @@ func NewAnalyzer[Item any](
 		processor,
 		target,
 		logger,
-		prometheus.NewGauge(prometheus.GaugeOpts{
-			Name: fmt.Sprintf("%s_queue_length", name),
-			Help: fmt.Sprintf("count of items in the work queue for the %s analyzer", name),
-		}),
+		metrics.NewDefaultAnalysisMetrics(name),
 	}
-	prometheus.MustRegister(a.queueLengthMetric)
 
 	return a, nil
 }
@@ -105,7 +100,7 @@ func (a *itemBasedAnalyzer[Item]) sendQueueLengthMetric(ctx context.Context) (in
 		a.logger.Warn("error fetching queue length", "err", err)
 		return 0, err
 	}
-	a.queueLengthMetric.Set(float64(queueLength))
+	a.metrics.QueueLength(a.analyzerName).Set(float64(queueLength))
 	return queueLength, nil
 }
 

analyzer/node_stats/node_stats.go

@@ -15,34 +15,48 @@ import (
 	"github.com/oasisprotocol/nexus/storage/oasis/nodeapi"
 
 	consensusAPI "github.com/oasisprotocol/nexus/coreapi/v22.2.11/consensus/api"
+	runtimeAPI "github.com/oasisprotocol/nexus/coreapi/v22.2.11/runtime/client/api"
 )
 
 const (
 	nodeStatsAnalyzerName = "node_stats"
 )
 
 type processor struct {
-	source nodeapi.ConsensusApiLite
-	target storage.TargetStorage
-	logger *log.Logger
+	layers         []common.Layer
+	source         nodeapi.ConsensusApiLite
+	emeraldSource  nodeapi.RuntimeApiLite
+	sapphireSource nodeapi.RuntimeApiLite
+	target         storage.TargetStorage
+	logger         *log.Logger
 }
 
 var _ item.ItemProcessor[common.Layer] = (*processor)(nil)
 
 func NewAnalyzer(
 	cfg config.ItemBasedAnalyzerConfig,
+	layers []common.Layer,
 	sourceClient nodeapi.ConsensusApiLite,
+	emeraldClient nodeapi.RuntimeApiLite,
+	sapphireClient nodeapi.RuntimeApiLite,
 	target storage.TargetStorage,
 	logger *log.Logger,
 ) (analyzer.Analyzer, error) {
 	if cfg.Interval == 0 {
 		cfg.Interval = 3 * time.Second
 	}
 	logger = logger.With("analyzer", nodeStatsAnalyzerName)
+	// Default to [consensus, emerald, sapphire] if layers is not specified.
+	if len(layers) == 0 {
+		layers = []common.Layer{common.LayerConsensus, common.LayerEmerald, common.LayerSapphire}
+	}
 	p := &processor{
-		source: sourceClient,
-		target: target,
-		logger: logger.With("analyzer", nodeStatsAnalyzerName),
+		layers:         layers,
+		source:         sourceClient,
+		emeraldSource:  emeraldClient,
+		sapphireSource: sapphireClient,
+		target:         target,
+		logger:         logger.With("analyzer", nodeStatsAnalyzerName),
 	}
 
 	return item.NewAnalyzer[common.Layer](
@@ -54,22 +68,37 @@ func NewAnalyzer(
 }
 
 func (p *processor) GetItems(ctx context.Context, limit uint64) ([]common.Layer, error) {
-	return []common.Layer{common.LayerConsensus}, nil
+	return p.layers, nil
 }
 
 func (p *processor) ProcessItem(ctx context.Context, batch *storage.QueryBatch, layer common.Layer) error {
 	p.logger.Debug("fetching node height", "layer", layer)
-	// We currently only support consensus. Update when this is no longer the case.
-	if layer != common.LayerConsensus {
+	latestHeight := uint64(0) // will be fetched from the node
+	switch layer {
+	case common.LayerConsensus:
+		latestBlock, err := p.source.GetBlock(ctx, consensusAPI.HeightLatest)
+		if err != nil {
+			return fmt.Errorf("error fetching latest block height for layer %s: %w", layer, err)
+		}
+		latestHeight = uint64(latestBlock.Height)
+	case common.LayerEmerald:
+		latestBlock, err := p.emeraldSource.GetBlockHeader(ctx, runtimeAPI.RoundLatest)
+		if err != nil {
+			return fmt.Errorf("error fetching latest block height for layer %s: %w", layer, err)
+		}
+		latestHeight = latestBlock.Round
+	case common.LayerSapphire:
+		latestBlock, err := p.sapphireSource.GetBlockHeader(ctx, runtimeAPI.RoundLatest)
+		if err != nil {
+			return fmt.Errorf("error fetching latest block height for layer %s: %w", layer, err)
+		}
+		latestHeight = latestBlock.Round
+	default:
 		return fmt.Errorf("unsupported layer %s", layer)
 	}
-	latestBlock, err := p.source.GetBlock(ctx, consensusAPI.HeightLatest)
-	if err != nil {
-		return fmt.Errorf("error fetching latest block height for layer %s, %w", layer, err)
-	}
-	batch.Queue(queries.ConsensusNodeHeightUpsert,
+	batch.Queue(queries.NodeHeightUpsert,
 		layer,
-		latestBlock.Height,
+		latestHeight,
 	)
 
 	return nil

analyzer/queries/queries.go

@@ -152,7 +152,12 @@ var (
       SET processed_time = CURRENT_TIMESTAMP, is_fast_sync = $3
       WHERE height = $1 AND analyzer = $2`
 
-	ConsensusNodeHeightUpsert = `
+	NodeHeight = `
+    SELECT height
+    FROM chain.latest_node_heights
+    WHERE layer = $1`
+
+	NodeHeightUpsert = `
     INSERT INTO chain.latest_node_heights (layer, height)
       VALUES
         ($1, $2)

cmd/analyzer/analyzer.go

@@ -471,7 +471,15 @@ func NewService(cfg *config.AnalysisConfig) (*Service, error) { //nolint:gocyclo
 			if err1 != nil {
 				return nil, err1
 			}
-			return nodestats.NewAnalyzer(cfg.Analyzers.NodeStats.ItemBasedAnalyzerConfig, sourceClient, dbClient, logger)
+			emeraldClient, err1 := sources.Runtime(ctx, common.RuntimeEmerald)
+			if err1 != nil {
+				return nil, err1
+			}
+			sapphireClient, err1 := sources.Runtime(ctx, common.RuntimeSapphire)
+			if err1 != nil {
+				return nil, err1
+			}
+			return nodestats.NewAnalyzer(cfg.Analyzers.NodeStats.ItemBasedAnalyzerConfig, cfg.Analyzers.NodeStats.Layers, sourceClient, emeraldClient, sapphireClient, dbClient, logger)
 		})
 	}
 	if cfg.Analyzers.AggregateStats != nil {