Metrics for sync phases (#7390)

* add metrics to measure the time for chain and world state sync

Signed-off-by: stefan.pingel@consensys.net <stefan.pingel@consensys.net>
Signed-off-by: Stefan Pingel <16143240+pinges@users.noreply.github.com>
Co-authored-by: Simon Dudley <simon.dudley@consensys.net>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>

ethereum/eth/src/jmh/java/org/hyperledger/besu/ethereum/eth/sync/worldstate/WorldStateDownloaderBenchmark.java

@@ -43,6 +43,7 @@ import org.hyperledger.besu.ethereum.worldstate.DataStorageConfiguration;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateArchive;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
 import org.hyperledger.besu.metrics.ObservableMetricsSystem;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.metrics.noop.NoOpMetricsSystem;
 import org.hyperledger.besu.plugin.services.storage.rocksdb.RocksDBKeyValueStorageFactory;
 import org.hyperledger.besu.plugin.services.storage.rocksdb.RocksDBMetricsFactory;
@@ -120,7 +121,8 @@ public class WorldStateDownloaderBenchmark {
             syncConfig.getWorldStateMaxRequestsWithoutProgress(),
             syncConfig.getWorldStateMinMillisBeforeStalling(),
             Clock.fixed(Instant.ofEpochSecond(1000), ZoneOffset.UTC),
-            metricsSystem);
+            metricsSystem,
+            SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
   }
 
   private Hash createExistingWorldState() {

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/DefaultSynchronizer.java

@@ -38,6 +38,7 @@ import org.hyperledger.besu.ethereum.storage.StorageProvider;
 import org.hyperledger.besu.ethereum.trie.diffbased.bonsai.BonsaiWorldStateProvider;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
 import org.hyperledger.besu.metrics.BesuMetricCategory;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.data.SyncStatus;
 import org.hyperledger.besu.plugin.services.BesuEvents;
 import org.hyperledger.besu.plugin.services.BesuEvents.SyncStatusListener;
@@ -67,6 +68,7 @@ public class DefaultSynchronizer implements Synchronizer, UnverifiedForkchoiceLi
   private final AtomicBoolean running = new AtomicBoolean(false);
   private final Optional<BlockPropagationManager> blockPropagationManager;
   private final Supplier<Optional<FastSyncDownloader<?>>> fastSyncFactory;
+  private final SyncDurationMetrics syncDurationMetrics;
   private Optional<FastSyncDownloader<?>> fastSyncDownloader;
   private final Optional<FullSyncDownloader> fullSyncDownloader;
   private final ProtocolContext protocolContext;
@@ -118,6 +120,8 @@ public class DefaultSynchronizer implements Synchronizer, UnverifiedForkchoiceLi
                     metricsSystem,
                     blockBroadcaster));
 
+    syncDurationMetrics = new SyncDurationMetrics(metricsSystem);
+
     this.fullSyncDownloader =
         terminationCondition.shouldStopDownload()
             ? Optional.empty()
@@ -129,7 +133,8 @@ public class DefaultSynchronizer implements Synchronizer, UnverifiedForkchoiceLi
                     ethContext,
                     syncState,
                     metricsSystem,
-                    terminationCondition));
+                    terminationCondition,
+                    syncDurationMetrics));
 
     if (SyncMode.FAST.equals(syncConfig.getSyncMode())) {
       this.fastSyncFactory =
@@ -144,7 +149,8 @@ public class DefaultSynchronizer implements Synchronizer, UnverifiedForkchoiceLi
                   ethContext,
                   worldStateStorageCoordinator,
                   syncState,
-                  clock);
+                  clock,
+                  syncDurationMetrics);
     } else if (syncConfig.getSyncMode() == SyncMode.CHECKPOINT) {
       this.fastSyncFactory =
           () ->
@@ -159,7 +165,8 @@ public class DefaultSynchronizer implements Synchronizer, UnverifiedForkchoiceLi
                   ethContext,
                   worldStateStorageCoordinator,
                   syncState,
-                  clock);
+                  clock,
+                  syncDurationMetrics);
     } else {
       this.fastSyncFactory =
           () ->
@@ -174,7 +181,8 @@ public class DefaultSynchronizer implements Synchronizer, UnverifiedForkchoiceLi
                   ethContext,
                   worldStateStorageCoordinator,
                   syncState,
-                  clock);
+                  clock,
+                  syncDurationMetrics);
     }
 
     // create a non-resync fast sync downloader:
@@ -205,6 +213,9 @@ public class DefaultSynchronizer implements Synchronizer, UnverifiedForkchoiceLi
   public CompletableFuture<Void> start() {
     if (running.compareAndSet(false, true)) {
       LOG.info("Starting synchronizer.");
+
+      syncDurationMetrics.startTimer(SyncDurationMetrics.Labels.TOTAL_SYNC_DURATION);
+
       blockPropagationManager.ifPresent(
           manager -> {
             if (!manager.isRunning()) {
@@ -390,6 +401,10 @@ public class DefaultSynchronizer implements Synchronizer, UnverifiedForkchoiceLi
     blockPropagationManager.ifPresent(BlockPropagationManager::stop);
     LOG.info("Stopping the pruner.");
     running.set(false);
+
+    syncDurationMetrics.stopTimer(SyncDurationMetrics.Labels.FLAT_DB_HEAL);
+    syncDurationMetrics.stopTimer(SyncDurationMetrics.Labels.TOTAL_SYNC_DURATION);
+
     return null;
   }
 

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/PipelineChainDownloader.java

@@ -24,6 +24,7 @@ import org.hyperledger.besu.ethereum.eth.sync.state.SyncTarget;
 import org.hyperledger.besu.ethereum.eth.sync.tasks.exceptions.InvalidBlockException;
 import org.hyperledger.besu.ethereum.p2p.rlpx.wire.messages.DisconnectMessage.DisconnectReason;
 import org.hyperledger.besu.metrics.BesuMetricCategory;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.plugin.services.metrics.Counter;
 import org.hyperledger.besu.plugin.services.metrics.LabelledMetric;
@@ -51,6 +52,7 @@ public class PipelineChainDownloader implements ChainDownloader {
   private final AtomicBoolean cancelled = new AtomicBoolean(false);
   private final Counter pipelineCompleteCounter;
   private final Counter pipelineErrorCounter;
+  private final SyncDurationMetrics syncDurationMetrics;
   private Pipeline<?> currentDownloadPipeline;
 
   public PipelineChainDownloader(
@@ -58,11 +60,13 @@ public class PipelineChainDownloader implements ChainDownloader {
       final AbstractSyncTargetManager syncTargetManager,
       final DownloadPipelineFactory downloadPipelineFactory,
       final EthScheduler scheduler,
-      final MetricsSystem metricsSystem) {
+      final MetricsSystem metricsSystem,
+      final SyncDurationMetrics syncDurationMetrics) {
     this.syncState = syncState;
     this.syncTargetManager = syncTargetManager;
     this.downloadPipelineFactory = downloadPipelineFactory;
     this.scheduler = scheduler;
+    this.syncDurationMetrics = syncDurationMetrics;
 
     final LabelledMetric<Counter> labelledCounter =
         metricsSystem.createLabelledCounter(
@@ -79,6 +83,9 @@ public class PipelineChainDownloader implements ChainDownloader {
     if (!started.compareAndSet(false, true)) {
       throw new IllegalStateException("Cannot start a chain download twice");
     }
+
+    syncDurationMetrics.startTimer(SyncDurationMetrics.Labels.CHAIN_DOWNLOAD_DURATION);
+
     return performDownload();
   }
 

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/checkpointsync/CheckpointDownloaderFactory.java

@@ -36,6 +36,7 @@ import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
 import org.hyperledger.besu.ethereum.mainnet.ScheduleBasedBlockHeaderFunctions;
 import org.hyperledger.besu.ethereum.trie.CompactEncoding;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.services.tasks.InMemoryTasksPriorityQueues;
 
@@ -62,7 +63,8 @@ public class CheckpointDownloaderFactory extends SnapDownloaderFactory {
       final EthContext ethContext,
       final WorldStateStorageCoordinator worldStateStorageCoordinator,
       final SyncState syncState,
-      final Clock clock) {
+      final Clock clock,
+      final SyncDurationMetrics syncDurationMetrics) {
 
     final Path fastSyncDataDirectory = dataDirectory.resolve(FAST_SYNC_FOLDER);
     final FastSyncStateStorage fastSyncStateStorage =
@@ -149,7 +151,8 @@ public class CheckpointDownloaderFactory extends SnapDownloaderFactory {
             syncConfig.getWorldStateMaxRequestsWithoutProgress(),
             syncConfig.getWorldStateMinMillisBeforeStalling(),
             clock,
-            metricsSystem);
+            metricsSystem,
+            syncDurationMetrics);
     final FastSyncDownloader<SnapDataRequest> fastSyncDownloader =
         new SnapSyncDownloader(
             fastSyncActions,
@@ -158,7 +161,8 @@ public class CheckpointDownloaderFactory extends SnapDownloaderFactory {
             fastSyncStateStorage,
             snapTaskCollection,
             fastSyncDataDirectory,
-            snapSyncState);
+            snapSyncState,
+            syncDurationMetrics);
     syncState.setWorldStateDownloadStatus(snapWorldStateDownloader);
     return Optional.of(fastSyncDownloader);
   }

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/checkpointsync/CheckpointSyncActions.java

@@ -24,6 +24,7 @@ import org.hyperledger.besu.ethereum.eth.sync.fastsync.FastSyncState;
 import org.hyperledger.besu.ethereum.eth.sync.state.SyncState;
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 
 public class CheckpointSyncActions extends FastSyncActions {
@@ -48,7 +49,8 @@ public class CheckpointSyncActions extends FastSyncActions {
   }
 
   @Override
-  public ChainDownloader createChainDownloader(final FastSyncState currentState) {
+  public ChainDownloader createChainDownloader(
+      final FastSyncState currentState, final SyncDurationMetrics syncDurationMetrics) {
     return CheckpointSyncChainDownloader.create(
         syncConfig,
         worldStateStorageCoordinator,
@@ -57,6 +59,7 @@ public class CheckpointSyncActions extends FastSyncActions {
         ethContext,
         syncState,
         metricsSystem,
-        currentState);
+        currentState,
+        syncDurationMetrics);
   }
 }

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/checkpointsync/CheckpointSyncChainDownloader.java

@@ -25,6 +25,7 @@ import org.hyperledger.besu.ethereum.eth.sync.fastsync.SyncTargetManager;
 import org.hyperledger.besu.ethereum.eth.sync.state.SyncState;
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 
 public class CheckpointSyncChainDownloader extends FastSyncChainDownloader {
@@ -37,7 +38,8 @@ public class CheckpointSyncChainDownloader extends FastSyncChainDownloader {
       final EthContext ethContext,
       final SyncState syncState,
       final MetricsSystem metricsSystem,
-      final FastSyncState fastSyncState) {
+      final FastSyncState fastSyncState,
+      final SyncDurationMetrics syncDurationMetrics) {
 
     final SyncTargetManager syncTargetManager =
         new SyncTargetManager(
@@ -55,6 +57,7 @@ public class CheckpointSyncChainDownloader extends FastSyncChainDownloader {
         new CheckpointSyncDownloadPipelineFactory(
             config, protocolSchedule, protocolContext, ethContext, fastSyncState, metricsSystem),
         ethContext.getScheduler(),
-        metricsSystem);
+        metricsSystem,
+        syncDurationMetrics);
   }
 }

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/FastSyncActions.java

@@ -28,6 +28,7 @@ import org.hyperledger.besu.ethereum.eth.sync.tasks.RetryingGetHeaderFromPeerByH
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
 import org.hyperledger.besu.metrics.BesuMetricCategory;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.plugin.services.metrics.Counter;
 
@@ -155,7 +156,8 @@ public class FastSyncActions {
     return fastSyncState;
   }
 
-  public ChainDownloader createChainDownloader(final FastSyncState currentState) {
+  public ChainDownloader createChainDownloader(
+      final FastSyncState currentState, final SyncDurationMetrics syncDurationMetrics) {
     return FastSyncChainDownloader.create(
         syncConfig,
         worldStateStorageCoordinator,
@@ -164,7 +166,8 @@ public class FastSyncActions {
         ethContext,
         syncState,
         metricsSystem,
-        currentState);
+        currentState,
+        syncDurationMetrics);
   }
 
   private CompletableFuture<FastSyncState> downloadPivotBlockHeader(final Hash hash) {

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/FastSyncChainDownloader.java

@@ -22,6 +22,7 @@ import org.hyperledger.besu.ethereum.eth.sync.SynchronizerConfiguration;
 import org.hyperledger.besu.ethereum.eth.sync.state.SyncState;
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 
 public class FastSyncChainDownloader {
@@ -36,7 +37,8 @@ public class FastSyncChainDownloader {
       final EthContext ethContext,
       final SyncState syncState,
       final MetricsSystem metricsSystem,
-      final FastSyncState fastSyncState) {
+      final FastSyncState fastSyncState,
+      final SyncDurationMetrics syncDurationMetrics) {
 
     final SyncTargetManager syncTargetManager =
         new SyncTargetManager(
@@ -53,6 +55,7 @@ public class FastSyncChainDownloader {
         new FastSyncDownloadPipelineFactory(
             config, protocolSchedule, protocolContext, ethContext, fastSyncState, metricsSystem),
         ethContext.getScheduler(),
-        metricsSystem);
+        metricsSystem,
+        syncDurationMetrics);
   }
 }

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/FastSyncDownloader.java

@@ -23,6 +23,7 @@ import org.hyperledger.besu.ethereum.eth.sync.worldstate.StalledDownloadExceptio
 import org.hyperledger.besu.ethereum.eth.sync.worldstate.WorldStateDownloader;
 import org.hyperledger.besu.ethereum.trie.diffbased.bonsai.storage.BonsaiWorldStateKeyValueStorage;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.storage.DataStorageFormat;
 import org.hyperledger.besu.services.tasks.TaskCollection;
 import org.hyperledger.besu.util.ExceptionUtils;
@@ -52,6 +53,7 @@ public class FastSyncDownloader<REQUEST> {
   private final WorldStateDownloader worldStateDownloader;
   private final TaskCollection<REQUEST> taskCollection;
   private final Path fastSyncDataDirectory;
+  private final SyncDurationMetrics syncDurationMetrics;
   private volatile Optional<TrailingPeerRequirements> trailingPeerRequirements = Optional.empty();
   private final AtomicBoolean running = new AtomicBoolean(false);
 
@@ -66,7 +68,8 @@ public class FastSyncDownloader<REQUEST> {
       final FastSyncStateStorage fastSyncStateStorage,
       final TaskCollection<REQUEST> taskCollection,
       final Path fastSyncDataDirectory,
-      final FastSyncState initialFastSyncState) {
+      final FastSyncState initialFastSyncState,
+      final SyncDurationMetrics syncDurationMetrics) {
     this.fastSyncActions = fastSyncActions;
     this.worldStateStorageCoordinator = worldStateStorageCoordinator;
     this.worldStateDownloader = worldStateDownloader;
@@ -74,6 +77,7 @@ public class FastSyncDownloader<REQUEST> {
     this.taskCollection = taskCollection;
     this.fastSyncDataDirectory = fastSyncDataDirectory;
     this.initialFastSyncState = initialFastSyncState;
+    this.syncDurationMetrics = syncDurationMetrics;
   }
 
   public CompletableFuture<FastSyncState> start() {
@@ -81,6 +85,7 @@ public class FastSyncDownloader<REQUEST> {
       throw new IllegalStateException("SyncDownloader already running");
     }
     LOG.info("Starting pivot-based sync");
+
     return start(initialFastSyncState);
   }
 
@@ -189,7 +194,8 @@ public class FastSyncDownloader<REQUEST> {
       }
       final CompletableFuture<Void> worldStateFuture =
           worldStateDownloader.run(fastSyncActions, currentState);
-      final ChainDownloader chainDownloader = fastSyncActions.createChainDownloader(currentState);
+      final ChainDownloader chainDownloader =
+          fastSyncActions.createChainDownloader(currentState, syncDurationMetrics);
       final CompletableFuture<Void> chainFuture = chainDownloader.start();
 
       // If either download fails, cancel the other one.

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/worldstate/FastDownloaderFactory.java

@@ -30,6 +30,7 @@ import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
 import org.hyperledger.besu.ethereum.mainnet.ScheduleBasedBlockHeaderFunctions;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
 import org.hyperledger.besu.metrics.BesuMetricCategory;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.services.tasks.InMemoryTasksPriorityQueues;
 
@@ -60,7 +61,8 @@ public class FastDownloaderFactory {
       final EthContext ethContext,
       final WorldStateStorageCoordinator worldStateStorageCoordinator,
       final SyncState syncState,
-      final Clock clock) {
+      final Clock clock,
+      final SyncDurationMetrics syncDurationMetrics) {
 
     final Path fastSyncDataDirectory = dataDirectory.resolve(FAST_SYNC_FOLDER);
     final FastSyncStateStorage fastSyncStateStorage =
@@ -114,7 +116,8 @@ public class FastDownloaderFactory {
             syncConfig.getWorldStateMaxRequestsWithoutProgress(),
             syncConfig.getWorldStateMinMillisBeforeStalling(),
             clock,
-            metricsSystem);
+            metricsSystem,
+            syncDurationMetrics);
     final FastSyncDownloader<NodeDataRequest> fastSyncDownloader =
         new FastSyncDownloader<>(
             new FastSyncActions(
@@ -131,7 +134,8 @@ public class FastDownloaderFactory {
             fastSyncStateStorage,
             taskCollection,
             fastSyncDataDirectory,
-            fastSyncState);
+            fastSyncState,
+            syncDurationMetrics);
     syncState.setWorldStateDownloadStatus(worldStateDownloader);
     return Optional.of(fastSyncDownloader);
   }

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/worldstate/FastWorldDownloadState.java

@@ -20,6 +20,7 @@ import org.hyperledger.besu.ethereum.core.BlockHeader;
 import org.hyperledger.besu.ethereum.eth.sync.worldstate.WorldDownloadState;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateKeyValueStorage;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.services.tasks.InMemoryTasksPriorityQueues;
 
 import java.time.Clock;
@@ -37,13 +38,15 @@ public class FastWorldDownloadState extends WorldDownloadState<NodeDataRequest>
       final InMemoryTasksPriorityQueues<NodeDataRequest> pendingRequests,
       final int maxRequestsWithoutProgress,
       final long minMillisBeforeStalling,
-      final Clock clock) {
+      final Clock clock,
+      final SyncDurationMetrics syncDurationMetrics) {
     super(
         worldStateStorageCoordinator,
         pendingRequests,
         maxRequestsWithoutProgress,
         minMillisBeforeStalling,
-        clock);
+        clock,
+        syncDurationMetrics);
   }
 
   @Override
@@ -70,7 +73,9 @@ public class FastWorldDownloadState extends WorldDownloadState<NodeDataRequest>
       // THere are no more inputs to process so make sure we wake up any threads waiting to dequeue
       // so they can give up waiting.
       notifyAll();
+
       LOG.info("Finished downloading world state from peers");
+
       return true;
     } else {
       return false;

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/worldstate/FastWorldStateDownloader.java

@@ -22,6 +22,7 @@ import org.hyperledger.besu.ethereum.eth.sync.fastsync.FastSyncState;
 import org.hyperledger.besu.ethereum.eth.sync.worldstate.WorldStateDownloader;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
 import org.hyperledger.besu.metrics.BesuMetricCategory;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.services.tasks.InMemoryTasksPriorityQueues;
 
@@ -51,6 +52,7 @@ public class FastWorldStateDownloader implements WorldStateDownloader {
   private final WorldStateStorageCoordinator worldStateStorageCoordinator;
 
   private final AtomicReference<FastWorldDownloadState> downloadState = new AtomicReference<>();
+  private final SyncDurationMetrics syncDurationMetrics;
 
   private Optional<CompleteTaskStep> maybeCompleteTask = Optional.empty();
 
@@ -63,7 +65,8 @@ public class FastWorldStateDownloader implements WorldStateDownloader {
       final int maxNodeRequestsWithoutProgress,
       final long minMillisBeforeStalling,
       final Clock clock,
-      final MetricsSystem metricsSystem) {
+      final MetricsSystem metricsSystem,
+      final SyncDurationMetrics syncDurationMetrics) {
     this.ethContext = ethContext;
     this.worldStateStorageCoordinator = worldStateStorageCoordinator;
     this.taskCollection = taskCollection;
@@ -73,6 +76,7 @@ public class FastWorldStateDownloader implements WorldStateDownloader {
     this.minMillisBeforeStalling = minMillisBeforeStalling;
     this.clock = clock;
     this.metricsSystem = metricsSystem;
+    this.syncDurationMetrics = syncDurationMetrics;
 
     metricsSystem.createIntegerGauge(
         BesuMetricCategory.SYNCHRONIZER,
@@ -137,7 +141,8 @@ public class FastWorldStateDownloader implements WorldStateDownloader {
               taskCollection,
               maxNodeRequestsWithoutProgress,
               minMillisBeforeStalling,
-              clock);
+              clock,
+              syncDurationMetrics);
       this.downloadState.set(newDownloadState);
 
       if (!newDownloadState.downloadWasResumed()) {

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/fullsync/FullSyncChainDownloader.java

@@ -21,6 +21,7 @@ import org.hyperledger.besu.ethereum.eth.sync.PipelineChainDownloader;
 import org.hyperledger.besu.ethereum.eth.sync.SynchronizerConfiguration;
 import org.hyperledger.besu.ethereum.eth.sync.state.SyncState;
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 
 public class FullSyncChainDownloader {
@@ -33,7 +34,8 @@ public class FullSyncChainDownloader {
       final EthContext ethContext,
       final SyncState syncState,
       final MetricsSystem metricsSystem,
-      final SyncTerminationCondition terminationCondition) {
+      final SyncTerminationCondition terminationCondition,
+      final SyncDurationMetrics syncDurationMetrics) {
 
     final FullSyncTargetManager syncTargetManager =
         new FullSyncTargetManager(
@@ -55,6 +57,7 @@ public class FullSyncChainDownloader {
             metricsSystem,
             terminationCondition),
         ethContext.getScheduler(),
-        metricsSystem);
+        metricsSystem,
+        syncDurationMetrics);
   }
 }

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/fullsync/FullSyncDownloader.java

@@ -21,6 +21,7 @@ import org.hyperledger.besu.ethereum.eth.sync.SynchronizerConfiguration;
 import org.hyperledger.besu.ethereum.eth.sync.TrailingPeerRequirements;
 import org.hyperledger.besu.ethereum.eth.sync.state.SyncState;
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 
 import java.util.concurrent.CompletableFuture;
@@ -43,7 +44,8 @@ public class FullSyncDownloader {
       final EthContext ethContext,
       final SyncState syncState,
       final MetricsSystem metricsSystem,
-      final SyncTerminationCondition terminationCondition) {
+      final SyncTerminationCondition terminationCondition,
+      final SyncDurationMetrics syncDurationMetrics) {
     this.syncConfig = syncConfig;
     this.protocolContext = protocolContext;
     this.syncState = syncState;
@@ -56,7 +58,8 @@ public class FullSyncDownloader {
             ethContext,
             syncState,
             metricsSystem,
-            terminationCondition);
+            terminationCondition,
+            syncDurationMetrics);
   }
 
   public CompletableFuture<Void> start() {

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/snapsync/SnapDownloaderFactory.java

@@ -33,6 +33,7 @@ import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
 import org.hyperledger.besu.ethereum.mainnet.ScheduleBasedBlockHeaderFunctions;
 import org.hyperledger.besu.ethereum.trie.CompactEncoding;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.services.tasks.InMemoryTasksPriorityQueues;
 
@@ -58,7 +59,8 @@ public class SnapDownloaderFactory extends FastDownloaderFactory {
       final EthContext ethContext,
       final WorldStateStorageCoordinator worldStateStorageCoordinator,
       final SyncState syncState,
-      final Clock clock) {
+      final Clock clock,
+      final SyncDurationMetrics syncDurationMetrics) {
 
     final Path fastSyncDataDirectory = dataDirectory.resolve(FAST_SYNC_FOLDER);
     final FastSyncStateStorage fastSyncStateStorage =
@@ -93,10 +95,7 @@ public class SnapDownloaderFactory extends FastDownloaderFactory {
       return Optional.empty();
     }
 
-    final SnapSyncProcessState snapSyncState =
-        new SnapSyncProcessState(
-            fastSyncStateStorage.loadState(
-                ScheduleBasedBlockHeaderFunctions.create(protocolSchedule)));
+    final SnapSyncProcessState snapSyncState = new SnapSyncProcessState(fastSyncState);
 
     final InMemoryTasksPriorityQueues<SnapDataRequest> snapTaskCollection =
         createSnapWorldStateDownloaderTaskCollection();
@@ -112,7 +111,8 @@ public class SnapDownloaderFactory extends FastDownloaderFactory {
             syncConfig.getWorldStateMaxRequestsWithoutProgress(),
             syncConfig.getWorldStateMinMillisBeforeStalling(),
             clock,
-            metricsSystem);
+            metricsSystem,
+            syncDurationMetrics);
     final FastSyncDownloader<SnapDataRequest> fastSyncDownloader =
         new SnapSyncDownloader(
             new FastSyncActions(
@@ -129,7 +129,8 @@ public class SnapDownloaderFactory extends FastDownloaderFactory {
             fastSyncStateStorage,
             snapTaskCollection,
             fastSyncDataDirectory,
-            snapSyncState);
+            snapSyncState,
+            syncDurationMetrics);
     syncState.setWorldStateDownloadStatus(snapWorldStateDownloader);
     return Optional.of(fastSyncDownloader);
   }

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/snapsync/SnapSyncDownloader.java

@@ -21,6 +21,7 @@ import org.hyperledger.besu.ethereum.eth.sync.fastsync.FastSyncStateStorage;
 import org.hyperledger.besu.ethereum.eth.sync.snapsync.request.SnapDataRequest;
 import org.hyperledger.besu.ethereum.eth.sync.worldstate.WorldStateDownloader;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.services.tasks.TaskCollection;
 
 import java.nio.file.Path;
@@ -35,7 +36,8 @@ public class SnapSyncDownloader extends FastSyncDownloader<SnapDataRequest> {
       final FastSyncStateStorage fastSyncStateStorage,
       final TaskCollection<SnapDataRequest> taskCollection,
       final Path fastSyncDataDirectory,
-      final FastSyncState initialFastSyncState) {
+      final FastSyncState initialFastSyncState,
+      final SyncDurationMetrics syncDurationMetrics) {
     super(
         fastSyncActions,
         worldStateStorageCoordinator,
@@ -43,7 +45,8 @@ public class SnapSyncDownloader extends FastSyncDownloader<SnapDataRequest> {
         fastSyncStateStorage,
         taskCollection,
         fastSyncDataDirectory,
-        initialFastSyncState);
+        initialFastSyncState,
+        syncDurationMetrics);
   }
 
   @Override

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/snapsync/SnapWorldDownloadState.java

@@ -36,6 +36,8 @@ import org.hyperledger.besu.ethereum.worldstate.FlatDbMode;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateKeyValueStorage;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
 import org.hyperledger.besu.metrics.BesuMetricCategory;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
+import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.plugin.services.storage.DataStorageFormat;
 import org.hyperledger.besu.services.tasks.InMemoryTaskQueue;
 import org.hyperledger.besu.services.tasks.InMemoryTasksPriorityQueues;
@@ -92,6 +94,8 @@ public class SnapWorldDownloadState extends WorldDownloadState<SnapDataRequest>
   // metrics around the snapsync
   private final SnapSyncMetricsManager metricsManager;
 
+  private final AtomicBoolean trieHealStartedBefore = new AtomicBoolean(false);
+
   public SnapWorldDownloadState(
       final WorldStateStorageCoordinator worldStateStorageCoordinator,
       final SnapSyncStatePersistenceManager snapContext,
@@ -102,13 +106,15 @@ public class SnapWorldDownloadState extends WorldDownloadState<SnapDataRequest>
       final long minMillisBeforeStalling,
       final SnapSyncMetricsManager metricsManager,
       final Clock clock,
-      final EthContext ethContext) {
+      final EthContext ethContext,
+      final SyncDurationMetrics syncDurationMetrics) {
     super(
         worldStateStorageCoordinator,
         pendingRequests,
         maxRequestsWithoutProgress,
         minMillisBeforeStalling,
-        clock);
+        clock,
+        syncDurationMetrics);
     this.snapContext = snapContext;
     this.blockchain = blockchain;
     this.snapSyncState = snapSyncState;
@@ -116,46 +122,34 @@ public class SnapWorldDownloadState extends WorldDownloadState<SnapDataRequest>
     this.blockObserverId = blockchain.observeBlockAdded(createBlockchainObserver());
     this.ethContext = ethContext;
 
-    metricsManager
-        .getMetricsSystem()
-        .createLongGauge(
-            BesuMetricCategory.SYNCHRONIZER,
-            "snap_world_state_pending_account_requests_current",
-            "Number of account pending requests for snap sync world state download",
-            pendingAccountRequests::size);
-    metricsManager
-        .getMetricsSystem()
-        .createLongGauge(
-            BesuMetricCategory.SYNCHRONIZER,
-            "snap_world_state_pending_storage_requests_current",
-            "Number of storage pending requests for snap sync world state download",
-            pendingStorageRequests::size);
-    metricsManager
-        .getMetricsSystem()
-        .createLongGauge(
-            BesuMetricCategory.SYNCHRONIZER,
-            "snap_world_state_pending_big_storage_requests_current",
-            "Number of storage pending requests for snap sync world state download",
-            pendingLargeStorageRequests::size);
-    metricsManager
-        .getMetricsSystem()
-        .createLongGauge(
-            BesuMetricCategory.SYNCHRONIZER,
-            "snap_world_state_pending_code_requests_current",
-            "Number of code pending requests for snap sync world state download",
-            pendingCodeRequests::size);
-    metricsManager
-        .getMetricsSystem()
-        .createLongGauge(
-            BesuMetricCategory.SYNCHRONIZER,
-            "snap_world_state_pending_trie_node_requests_current",
-            "Number of trie node pending requests for snap sync world state download",
-            pendingTrieNodeRequests::size);
-  }
-
-  @Override
-  public synchronized void notifyTaskAvailable() {
-    notifyAll();
+    final MetricsSystem metricsSystem = metricsManager.getMetricsSystem();
+    metricsSystem.createLongGauge(
+        BesuMetricCategory.SYNCHRONIZER,
+        "snap_world_state_pending_account_requests_current",
+        "Number of account pending requests for snap sync world state download",
+        pendingAccountRequests::size);
+    metricsSystem.createLongGauge(
+        BesuMetricCategory.SYNCHRONIZER,
+        "snap_world_state_pending_storage_requests_current",
+        "Number of storage pending requests for snap sync world state download",
+        pendingStorageRequests::size);
+    metricsSystem.createLongGauge(
+        BesuMetricCategory.SYNCHRONIZER,
+        "snap_world_state_pending_big_storage_requests_current",
+        "Number of storage pending requests for snap sync world state download",
+        pendingLargeStorageRequests::size);
+    metricsSystem.createLongGauge(
+        BesuMetricCategory.SYNCHRONIZER,
+        "snap_world_state_pending_code_requests_current",
+        "Number of code pending requests for snap sync world state download",
+        pendingCodeRequests::size);
+    metricsSystem.createLongGauge(
+        BesuMetricCategory.SYNCHRONIZER,
+        "snap_world_state_pending_trie_node_requests_current",
+        "Number of trie node pending requests for snap sync world state download",
+        pendingTrieNodeRequests::size);
+    syncDurationMetrics.startTimer(
+        SyncDurationMetrics.Labels.SNAP_INITIAL_WORLD_STATE_DOWNLOAD_DURATION);
   }
 
   @Override
@@ -191,6 +185,9 @@ public class SnapWorldDownloadState extends WorldDownloadState<SnapDataRequest>
       // if all snapsync tasks are completed and the healing was running and the blockchain is not
       // behind the pivot block
       else {
+        syncDurationMetrics.stopTimer(SyncDurationMetrics.Labels.SNAP_WORLD_STATE_HEALING_DURATION);
+        syncDurationMetrics.stopTimer(SyncDurationMetrics.Labels.CHAIN_DOWNLOAD_DURATION);
+
         // If the flat database healing process is not in progress and the flat database mode is
         // FULL
         if (!snapSyncState.isHealFlatDatabaseInProgress()
@@ -217,6 +214,7 @@ public class SnapWorldDownloadState extends WorldDownloadState<SnapDataRequest>
           // Clear the snap context
           snapContext.clear();
           internalFuture.complete(null);
+
           return true;
         }
       }
@@ -236,6 +234,12 @@ public class SnapWorldDownloadState extends WorldDownloadState<SnapDataRequest>
 
   /** Method to start the healing process of the trie */
   public synchronized void startTrieHeal() {
+    if (trieHealStartedBefore.compareAndSet(false, true)) {
+      syncDurationMetrics.stopTimer(
+          SyncDurationMetrics.Labels.SNAP_INITIAL_WORLD_STATE_DOWNLOAD_DURATION);
+
+      syncDurationMetrics.startTimer(SyncDurationMetrics.Labels.SNAP_WORLD_STATE_HEALING_DURATION);
+    }
     snapContext.clearAccountRangeTasks();
     snapSyncState.setHealTrieStatus(true);
     // Try to find a new pivot block before starting the healing process
@@ -272,6 +276,7 @@ public class SnapWorldDownloadState extends WorldDownloadState<SnapDataRequest>
 
   public synchronized void startFlatDatabaseHeal(final BlockHeader header) {
     LOG.info("Initiating the healing process for the flat database");
+    syncDurationMetrics.startTimer(SyncDurationMetrics.Labels.FLAT_DB_HEAL);
     snapSyncState.setHealFlatDatabaseInProgress(true);
     final Map<Bytes32, Bytes32> ranges = RangeManager.generateAllRanges(16);
     ranges.forEach(

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/snapsync/SnapWorldStateDownloader.java

@@ -31,6 +31,7 @@ import org.hyperledger.besu.ethereum.trie.RangeManager;
 import org.hyperledger.besu.ethereum.trie.diffbased.bonsai.storage.BonsaiWorldStateKeyValueStorage;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
 import org.hyperledger.besu.metrics.BesuMetricCategory;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.plugin.services.storage.DataStorageFormat;
 import org.hyperledger.besu.services.tasks.InMemoryTasksPriorityQueues;
@@ -67,6 +68,7 @@ public class SnapWorldStateDownloader implements WorldStateDownloader {
   private final WorldStateStorageCoordinator worldStateStorageCoordinator;
 
   private final AtomicReference<SnapWorldDownloadState> downloadState = new AtomicReference<>();
+  private final SyncDurationMetrics syncDurationMetrics;
 
   public SnapWorldStateDownloader(
       final EthContext ethContext,
@@ -79,7 +81,8 @@ public class SnapWorldStateDownloader implements WorldStateDownloader {
       final int maxNodeRequestsWithoutProgress,
       final long minMillisBeforeStalling,
       final Clock clock,
-      final MetricsSystem metricsSystem) {
+      final MetricsSystem metricsSystem,
+      final SyncDurationMetrics syncDurationMetrics) {
     this.ethContext = ethContext;
     this.protocolContext = protocolContext;
     this.worldStateStorageCoordinator = worldStateStorageCoordinator;
@@ -91,6 +94,7 @@ public class SnapWorldStateDownloader implements WorldStateDownloader {
     this.minMillisBeforeStalling = minMillisBeforeStalling;
     this.clock = clock;
     this.metricsSystem = metricsSystem;
+    this.syncDurationMetrics = syncDurationMetrics;
 
     metricsSystem.createIntegerGauge(
         BesuMetricCategory.SYNCHRONIZER,
@@ -148,7 +152,8 @@ public class SnapWorldStateDownloader implements WorldStateDownloader {
               minMillisBeforeStalling,
               snapsyncMetricsManager,
               clock,
-              ethContext);
+              ethContext,
+              syncDurationMetrics);
 
       final Map<Bytes32, Bytes32> ranges = RangeManager.generateAllRanges(16);
       snapsyncMetricsManager.initRange(ranges);

ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/sync/worldstate/WorldDownloadState.java

@@ -18,6 +18,7 @@ import org.hyperledger.besu.ethereum.core.BlockHeader;
 import org.hyperledger.besu.ethereum.eth.manager.EthScheduler;
 import org.hyperledger.besu.ethereum.eth.manager.task.EthTask;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.services.tasks.InMemoryTasksPriorityQueues;
 import org.hyperledger.besu.services.tasks.Task;
 import org.hyperledger.besu.services.tasks.TasksPriorityProvider;
@@ -37,6 +38,7 @@ import org.slf4j.LoggerFactory;
 
 public abstract class WorldDownloadState<REQUEST extends TasksPriorityProvider> {
   private static final Logger LOG = LoggerFactory.getLogger(WorldDownloadState.class);
+  protected final SyncDurationMetrics syncDurationMetrics;
 
   private boolean downloadWasResumed;
   protected final InMemoryTasksPriorityQueues<REQUEST> pendingRequests;
@@ -61,7 +63,8 @@ public abstract class WorldDownloadState<REQUEST extends TasksPriorityProvider>
       final InMemoryTasksPriorityQueues<REQUEST> pendingRequests,
       final int maxRequestsWithoutProgress,
       final long minMillisBeforeStalling,
-      final Clock clock) {
+      final Clock clock,
+      final SyncDurationMetrics syncDurationMetrics) {
     this.worldStateStorageCoordinator = worldStateStorageCoordinator;
     this.minMillisBeforeStalling = minMillisBeforeStalling;
     this.timestampOfLastProgress = clock.millis();
@@ -69,6 +72,7 @@ public abstract class WorldDownloadState<REQUEST extends TasksPriorityProvider>
     this.pendingRequests = pendingRequests;
     this.maxRequestsWithoutProgress = maxRequestsWithoutProgress;
     this.clock = clock;
+    this.syncDurationMetrics = syncDurationMetrics;
     this.internalFuture = new CompletableFuture<>();
     this.downloadFuture = new CompletableFuture<>();
     this.internalFuture.whenComplete(this::cleanup);

ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/PipelineChainDownloaderTest.java

@@ -34,6 +34,7 @@ import org.hyperledger.besu.ethereum.eth.sync.state.SyncState;
 import org.hyperledger.besu.ethereum.eth.sync.state.SyncTarget;
 import org.hyperledger.besu.ethereum.eth.sync.tasks.exceptions.InvalidBlockException;
 import org.hyperledger.besu.ethereum.p2p.rlpx.wire.messages.DisconnectMessage.DisconnectReason;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.metrics.noop.NoOpMetricsSystem;
 import org.hyperledger.besu.services.pipeline.Pipeline;
 
@@ -69,13 +70,15 @@ public class PipelineChainDownloaderTest {
   public void setUp() {
     syncTarget = new SyncTarget(peer1, commonAncestor);
     syncTarget2 = new SyncTarget(peer2, commonAncestor);
+    final NoOpMetricsSystem noOpMetricsSystem = new NoOpMetricsSystem();
     chainDownloader =
         new PipelineChainDownloader(
             syncState,
             syncTargetManager,
             downloadPipelineFactory,
             scheduler,
-            new NoOpMetricsSystem());
+            noOpMetricsSystem,
+            SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
   }
 
   @Test

ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/checkpointsync/CheckPointSyncChainDownloaderTest.java

@@ -40,6 +40,7 @@ import org.hyperledger.besu.ethereum.trie.diffbased.bonsai.storage.BonsaiWorldSt
 import org.hyperledger.besu.ethereum.trie.forest.storage.ForestWorldStateKeyValueStorage;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateKeyValueStorage;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.metrics.noop.NoOpMetricsSystem;
 import org.hyperledger.besu.plugin.services.storage.DataStorageFormat;
 
@@ -141,7 +142,8 @@ public class CheckPointSyncChainDownloaderTest {
         ethContext,
         syncState,
         new NoOpMetricsSystem(),
-        new FastSyncState(otherBlockchain.getBlockHeader(pivotBlockNumber).get()));
+        new FastSyncState(otherBlockchain.getBlockHeader(pivotBlockNumber).get()),
+        SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
   }
 
   @ParameterizedTest

ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/FastDownloaderFactoryTest.java

@@ -35,6 +35,7 @@ import org.hyperledger.besu.ethereum.trie.diffbased.bonsai.storage.BonsaiWorldSt
 import org.hyperledger.besu.ethereum.trie.forest.storage.ForestWorldStateKeyValueStorage;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateKeyValueStorage;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.plugin.services.storage.DataStorageFormat;
 
@@ -115,7 +116,8 @@ public class FastDownloaderFactoryTest {
                     ethContext,
                     worldStateStorageCoordinator,
                     syncState,
-                    clock))
+                    clock,
+                    SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .isInstanceOf(IllegalStateException.class);
   }
 
@@ -139,7 +141,8 @@ public class FastDownloaderFactoryTest {
             ethContext,
             worldStateStorageCoordinator,
             syncState,
-            clock);
+            clock,
+            SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     assertThat(result).isEmpty();
   }
 
@@ -166,7 +169,8 @@ public class FastDownloaderFactoryTest {
         ethContext,
         worldStateStorageCoordinator,
         syncState,
-        clock);
+        clock,
+        SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
 
     verify(mutableBlockchain).getChainHeadBlockNumber();
   }
@@ -200,7 +204,8 @@ public class FastDownloaderFactoryTest {
         ethContext,
         worldStateStorageCoordinator,
         syncState,
-        clock);
+        clock,
+        SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
 
     verify(worldStateKeyValueStorage).clear();
     assertThat(Files.exists(stateQueueDir)).isFalse();
@@ -236,7 +241,8 @@ public class FastDownloaderFactoryTest {
                     ethContext,
                     worldStateStorageCoordinator,
                     syncState,
-                    clock))
+                    clock,
+                    SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .isInstanceOf(IllegalStateException.class);
   }
 

ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/FastSyncChainDownloaderTest.java

@@ -36,6 +36,7 @@ import org.hyperledger.besu.ethereum.eth.sync.SynchronizerConfiguration;
 import org.hyperledger.besu.ethereum.eth.sync.state.SyncState;
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.metrics.noop.NoOpMetricsSystem;
 import org.hyperledger.besu.plugin.services.storage.DataStorageFormat;
 
@@ -111,7 +112,8 @@ public class FastSyncChainDownloaderTest {
         ethContext,
         syncState,
         new NoOpMetricsSystem(),
-        new FastSyncState(otherBlockchain.getBlockHeader(pivotBlockNumber).get()));
+        new FastSyncState(otherBlockchain.getBlockHeader(pivotBlockNumber).get()),
+        SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
   }
 
   @ParameterizedTest

ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/FastSyncDownloaderTest.java

@@ -38,6 +38,7 @@ import org.hyperledger.besu.ethereum.trie.diffbased.bonsai.storage.BonsaiWorldSt
 import org.hyperledger.besu.ethereum.trie.forest.storage.ForestWorldStateKeyValueStorage;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateKeyValueStorage;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.plugin.services.storage.DataStorageFormat;
 import org.hyperledger.besu.services.tasks.TaskCollection;
 
@@ -105,7 +106,8 @@ public class FastSyncDownloaderTest {
             storage,
             taskCollection,
             fastSyncDataDirectory,
-            FastSyncState.EMPTY_SYNC_STATE);
+            FastSyncState.EMPTY_SYNC_STATE,
+            SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
   }
 
   @ParameterizedTest
@@ -119,7 +121,8 @@ public class FastSyncDownloaderTest {
         .thenReturn(completedFuture(selectPivotBlockState));
     when(fastSyncActions.downloadPivotBlockHeader(selectPivotBlockState))
         .thenReturn(completedFuture(downloadPivotBlockHeaderState));
-    when(fastSyncActions.createChainDownloader(downloadPivotBlockHeaderState))
+    when(fastSyncActions.createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .thenReturn(chainDownloader);
     when(chainDownloader.start()).thenReturn(completedFuture(null));
     when(worldStateDownloader.run(
@@ -131,7 +134,9 @@ public class FastSyncDownloaderTest {
     verify(fastSyncActions).selectPivotBlock(FastSyncState.EMPTY_SYNC_STATE);
     verify(fastSyncActions).downloadPivotBlockHeader(selectPivotBlockState);
     verify(storage).storeState(downloadPivotBlockHeaderState);
-    verify(fastSyncActions).createChainDownloader(downloadPivotBlockHeaderState);
+    verify(fastSyncActions)
+        .createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     verify(chainDownloader).start();
     verify(worldStateDownloader)
         .run(any(FastSyncActions.class), eq(new FastSyncState(pivotBlockHeader)));
@@ -148,7 +153,9 @@ public class FastSyncDownloaderTest {
     final CompletableFuture<FastSyncState> complete = completedFuture(fastSyncState);
     when(fastSyncActions.selectPivotBlock(fastSyncState)).thenReturn(complete);
     when(fastSyncActions.downloadPivotBlockHeader(fastSyncState)).thenReturn(complete);
-    when(fastSyncActions.createChainDownloader(fastSyncState)).thenReturn(chainDownloader);
+    when(fastSyncActions.createChainDownloader(
+            fastSyncState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
+        .thenReturn(chainDownloader);
     when(chainDownloader.start()).thenReturn(completedFuture(null));
     when(worldStateDownloader.run(
             any(FastSyncActions.class), eq(new FastSyncState(pivotBlockHeader))))
@@ -162,14 +169,16 @@ public class FastSyncDownloaderTest {
             storage,
             taskCollection,
             fastSyncDataDirectory,
-            fastSyncState);
+            fastSyncState,
+            SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
 
     final CompletableFuture<FastSyncState> result = resumedDownloader.start();
 
     verify(fastSyncActions).selectPivotBlock(fastSyncState);
     verify(fastSyncActions).downloadPivotBlockHeader(fastSyncState);
     verify(storage).storeState(fastSyncState);
-    verify(fastSyncActions).createChainDownloader(fastSyncState);
+    verify(fastSyncActions)
+        .createChainDownloader(fastSyncState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     verify(chainDownloader).start();
     verify(worldStateDownloader)
         .run(any(FastSyncActions.class), eq(new FastSyncState(pivotBlockHeader)));
@@ -206,7 +215,8 @@ public class FastSyncDownloaderTest {
         .thenReturn(completedFuture(selectPivotBlockState));
     when(fastSyncActions.downloadPivotBlockHeader(selectPivotBlockState))
         .thenReturn(completedFuture(downloadPivotBlockHeaderState));
-    when(fastSyncActions.createChainDownloader(downloadPivotBlockHeaderState))
+    when(fastSyncActions.createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .thenReturn(chainDownloader);
     when(chainDownloader.start()).thenReturn(chainFuture);
     when(worldStateDownloader.run(
@@ -218,7 +228,9 @@ public class FastSyncDownloaderTest {
     verify(fastSyncActions).selectPivotBlock(FastSyncState.EMPTY_SYNC_STATE);
     verify(fastSyncActions).downloadPivotBlockHeader(selectPivotBlockState);
     verify(storage).storeState(downloadPivotBlockHeaderState);
-    verify(fastSyncActions).createChainDownloader(downloadPivotBlockHeaderState);
+    verify(fastSyncActions)
+        .createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     verify(worldStateDownloader)
         .run(any(FastSyncActions.class), eq(new FastSyncState(pivotBlockHeader)));
     verifyNoMoreInteractions(fastSyncActions, worldStateDownloader, storage);
@@ -246,7 +258,8 @@ public class FastSyncDownloaderTest {
         .thenReturn(completedFuture(selectPivotBlockState));
     when(fastSyncActions.downloadPivotBlockHeader(selectPivotBlockState))
         .thenReturn(completedFuture(downloadPivotBlockHeaderState));
-    when(fastSyncActions.createChainDownloader(downloadPivotBlockHeaderState))
+    when(fastSyncActions.createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .thenReturn(chainDownloader);
     when(chainDownloader.start()).thenReturn(chainFuture);
     when(worldStateDownloader.run(
@@ -257,7 +270,9 @@ public class FastSyncDownloaderTest {
 
     verify(fastSyncActions).selectPivotBlock(FastSyncState.EMPTY_SYNC_STATE);
     verify(fastSyncActions).downloadPivotBlockHeader(selectPivotBlockState);
-    verify(fastSyncActions).createChainDownloader(downloadPivotBlockHeaderState);
+    verify(fastSyncActions)
+        .createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     verify(worldStateDownloader)
         .run(any(FastSyncActions.class), eq(new FastSyncState(pivotBlockHeader)));
     verifyNoMoreInteractions(fastSyncActions);
@@ -321,7 +336,8 @@ public class FastSyncDownloaderTest {
         .thenReturn(completedFuture(selectPivotBlockState));
     when(fastSyncActions.downloadPivotBlockHeader(selectPivotBlockState))
         .thenReturn(completedFuture(downloadPivotBlockHeaderState));
-    when(fastSyncActions.createChainDownloader(downloadPivotBlockHeaderState))
+    when(fastSyncActions.createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .thenReturn(chainDownloader);
     when(chainDownloader.start()).thenReturn(chainFuture);
     when(worldStateDownloader.run(
@@ -332,7 +348,9 @@ public class FastSyncDownloaderTest {
 
     verify(fastSyncActions).selectPivotBlock(FastSyncState.EMPTY_SYNC_STATE);
     verify(fastSyncActions).downloadPivotBlockHeader(selectPivotBlockState);
-    verify(fastSyncActions).createChainDownloader(downloadPivotBlockHeaderState);
+    verify(fastSyncActions)
+        .createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     verify(worldStateDownloader)
         .run(any(FastSyncActions.class), eq(new FastSyncState(pivotBlockHeader)));
     verifyNoMoreInteractions(fastSyncActions);
@@ -359,7 +377,8 @@ public class FastSyncDownloaderTest {
         .thenReturn(completedFuture(selectPivotBlockState));
     when(fastSyncActions.downloadPivotBlockHeader(selectPivotBlockState))
         .thenReturn(completedFuture(downloadPivotBlockHeaderState));
-    when(fastSyncActions.createChainDownloader(downloadPivotBlockHeaderState))
+    when(fastSyncActions.createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .thenReturn(chainDownloader);
     when(chainDownloader.start()).thenReturn(chainFuture);
     when(worldStateDownloader.run(
@@ -370,7 +389,9 @@ public class FastSyncDownloaderTest {
 
     verify(fastSyncActions).selectPivotBlock(FastSyncState.EMPTY_SYNC_STATE);
     verify(fastSyncActions).downloadPivotBlockHeader(selectPivotBlockState);
-    verify(fastSyncActions).createChainDownloader(downloadPivotBlockHeaderState);
+    verify(fastSyncActions)
+        .createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     verify(worldStateDownloader)
         .run(any(FastSyncActions.class), eq(new FastSyncState(pivotBlockHeader)));
     verifyNoMoreInteractions(fastSyncActions);
@@ -407,7 +428,8 @@ public class FastSyncDownloaderTest {
             completedFuture(selectPivotBlockState), completedFuture(secondSelectPivotBlockState));
     when(fastSyncActions.downloadPivotBlockHeader(selectPivotBlockState))
         .thenReturn(completedFuture(downloadPivotBlockHeaderState));
-    when(fastSyncActions.createChainDownloader(downloadPivotBlockHeaderState))
+    when(fastSyncActions.createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .thenReturn(chainDownloader);
     when(chainDownloader.start()).thenReturn(chainFuture);
     when(worldStateDownloader.run(
@@ -418,7 +440,8 @@ public class FastSyncDownloaderTest {
     when(fastSyncActions.downloadPivotBlockHeader(secondSelectPivotBlockState))
         .thenReturn(completedFuture(secondDownloadPivotBlockHeaderState));
 
-    when(fastSyncActions.createChainDownloader(secondDownloadPivotBlockHeaderState))
+    when(fastSyncActions.createChainDownloader(
+            secondDownloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .thenReturn(secondChainDownloader);
     when(secondChainDownloader.start()).thenReturn(completedFuture(null));
     when(worldStateDownloader.run(
@@ -430,7 +453,9 @@ public class FastSyncDownloaderTest {
     verify(fastSyncActions).selectPivotBlock(FastSyncState.EMPTY_SYNC_STATE);
     verify(fastSyncActions).downloadPivotBlockHeader(selectPivotBlockState);
     verify(storage).storeState(downloadPivotBlockHeaderState);
-    verify(fastSyncActions).createChainDownloader(downloadPivotBlockHeaderState);
+    verify(fastSyncActions)
+        .createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     verify(worldStateDownloader)
         .run(any(FastSyncActions.class), eq(new FastSyncState(pivotBlockHeader)));
     verifyNoMoreInteractions(fastSyncActions, worldStateDownloader, storage);
@@ -446,7 +471,9 @@ public class FastSyncDownloaderTest {
     verify(fastSyncActions, times(2)).selectPivotBlock(FastSyncState.EMPTY_SYNC_STATE);
     verify(fastSyncActions).downloadPivotBlockHeader(secondSelectPivotBlockState);
     verify(storage).storeState(secondDownloadPivotBlockHeaderState);
-    verify(fastSyncActions).createChainDownloader(secondDownloadPivotBlockHeaderState);
+    verify(fastSyncActions)
+        .createChainDownloader(
+            secondDownloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     verify(worldStateDownloader)
         .run(any(FastSyncActions.class), eq(new FastSyncState(secondPivotBlockHeader)));
     verifyNoMoreInteractions(fastSyncActions, worldStateDownloader, storage);
@@ -481,7 +508,8 @@ public class FastSyncDownloaderTest {
             completedFuture(selectPivotBlockState), completedFuture(secondSelectPivotBlockState));
     when(fastSyncActions.downloadPivotBlockHeader(selectPivotBlockState))
         .thenReturn(completedFuture(downloadPivotBlockHeaderState));
-    when(fastSyncActions.createChainDownloader(downloadPivotBlockHeaderState))
+    when(fastSyncActions.createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .thenReturn(chainDownloader);
     when(chainDownloader.start()).thenReturn(chainFuture);
     when(worldStateDownloader.run(
@@ -494,7 +522,8 @@ public class FastSyncDownloaderTest {
     when(fastSyncActions.downloadPivotBlockHeader(secondSelectPivotBlockState))
         .thenReturn(completedFuture(secondDownloadPivotBlockHeaderState));
 
-    when(fastSyncActions.createChainDownloader(secondDownloadPivotBlockHeaderState))
+    when(fastSyncActions.createChainDownloader(
+            secondDownloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .thenReturn(secondChainDownloader);
     when(secondChainDownloader.start()).thenReturn(completedFuture(null));
     when(worldStateDownloader.run(
@@ -506,7 +535,9 @@ public class FastSyncDownloaderTest {
     verify(fastSyncActions).selectPivotBlock(FastSyncState.EMPTY_SYNC_STATE);
     verify(fastSyncActions).downloadPivotBlockHeader(selectPivotBlockState);
     verify(storage).storeState(downloadPivotBlockHeaderState);
-    verify(fastSyncActions).createChainDownloader(downloadPivotBlockHeaderState);
+    verify(fastSyncActions)
+        .createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     verify(worldStateDownloader)
         .run(any(FastSyncActions.class), eq(new FastSyncState(pivotBlockHeader)));
     verifyNoMoreInteractions(fastSyncActions, worldStateDownloader, storage);
@@ -524,7 +555,9 @@ public class FastSyncDownloaderTest {
     verify(fastSyncActions, times(2)).selectPivotBlock(FastSyncState.EMPTY_SYNC_STATE);
     verify(fastSyncActions).downloadPivotBlockHeader(secondSelectPivotBlockState);
     verify(storage).storeState(secondDownloadPivotBlockHeaderState);
-    verify(fastSyncActions).createChainDownloader(secondDownloadPivotBlockHeaderState);
+    verify(fastSyncActions)
+        .createChainDownloader(
+            secondDownloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     verify(worldStateDownloader)
         .run(any(FastSyncActions.class), eq(new FastSyncState(secondPivotBlockHeader)));
     verifyNoMoreInteractions(fastSyncActions, worldStateDownloader, storage);
@@ -556,7 +589,8 @@ public class FastSyncDownloaderTest {
         .thenReturn(completedFuture(selectPivotBlockState));
     when(fastSyncActions.downloadPivotBlockHeader(selectPivotBlockState))
         .thenReturn(completedFuture(downloadPivotBlockHeaderState));
-    when(fastSyncActions.createChainDownloader(downloadPivotBlockHeaderState))
+    when(fastSyncActions.createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .thenReturn(chainDownloader);
     when(chainDownloader.start()).thenReturn(new CompletableFuture<>());
     when(worldStateDownloader.run(
@@ -581,7 +615,8 @@ public class FastSyncDownloaderTest {
         .thenReturn(completedFuture(selectPivotBlockState));
     when(fastSyncActions.downloadPivotBlockHeader(selectPivotBlockState))
         .thenReturn(completedFuture(downloadPivotBlockHeaderState));
-    when(fastSyncActions.createChainDownloader(downloadPivotBlockHeaderState))
+    when(fastSyncActions.createChainDownloader(
+            downloadPivotBlockHeaderState, SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS))
         .thenReturn(chainDownloader);
     when(chainDownloader.start()).thenReturn(completedFuture(null));
     when(worldStateDownloader.run(

ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/worldstate/FastWorldDownloadStateTest.java

@@ -31,6 +31,7 @@ import org.hyperledger.besu.ethereum.trie.forest.storage.ForestWorldStateKeyValu
 import org.hyperledger.besu.ethereum.worldstate.DataStorageConfiguration;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateKeyValueStorage;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.metrics.noop.NoOpMetricsSystem;
 import org.hyperledger.besu.plugin.services.storage.DataStorageFormat;
 import org.hyperledger.besu.services.kvstore.InMemoryKeyValueStorage;
@@ -100,7 +101,8 @@ public class FastWorldDownloadStateTest {
             pendingRequests,
             MAX_REQUESTS_WITHOUT_PROGRESS,
             MIN_MILLIS_BEFORE_STALLING,
-            clock);
+            clock,
+            SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     assertThat(downloadState.isDownloading()).isTrue();
     downloadState.setRootNodeData(ROOT_NODE_DATA);
     future = downloadState.getDownloadFuture();

ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/fastsync/worldstate/FastWorldStateDownloaderTest.java

@@ -64,6 +64,7 @@ import org.hyperledger.besu.evm.account.Account;
 import org.hyperledger.besu.evm.account.AccountStorageEntry;
 import org.hyperledger.besu.evm.internal.EvmConfiguration;
 import org.hyperledger.besu.evm.worldstate.WorldState;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.metrics.noop.NoOpMetricsSystem;
 import org.hyperledger.besu.services.kvstore.InMemoryKeyValueStorage;
 import org.hyperledger.besu.services.tasks.InMemoryTasksPriorityQueues;
@@ -1051,7 +1052,8 @@ class FastWorldStateDownloaderTest {
         config.getWorldStateMaxRequestsWithoutProgress(),
         config.getWorldStateMinMillisBeforeStalling(),
         TestClock.fixed(),
-        new NoOpMetricsSystem());
+        new NoOpMetricsSystem(),
+        SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
   }
 
   private WorldStatePreimageStorage createPreimageStorage() {

ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/fullsync/FullSyncChainDownloaderForkTest.java

@@ -32,6 +32,7 @@ import org.hyperledger.besu.ethereum.eth.sync.SynchronizerConfiguration;
 import org.hyperledger.besu.ethereum.eth.sync.state.SyncState;
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
 import org.hyperledger.besu.ethereum.p2p.rlpx.wire.messages.DisconnectMessage.DisconnectReason;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.metrics.noop.NoOpMetricsSystem;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 
@@ -89,7 +90,8 @@ public class FullSyncChainDownloaderForkTest {
         ethContext,
         syncState,
         metricsSystem,
-        SyncTerminationCondition.never());
+        SyncTerminationCondition.never(),
+        SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
   }
 
   private ChainDownloader downloader() {

ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/fullsync/FullSyncChainDownloaderTest.java

@@ -42,6 +42,7 @@ import org.hyperledger.besu.ethereum.eth.sync.state.SyncState;
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
 import org.hyperledger.besu.ethereum.p2p.rlpx.wire.MessageData;
 import org.hyperledger.besu.ethereum.p2p.rlpx.wire.messages.DisconnectMessage.DisconnectReason;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.metrics.noop.NoOpMetricsSystem;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.plugin.services.storage.DataStorageFormat;
@@ -121,7 +122,8 @@ public class FullSyncChainDownloaderTest {
         ethContext,
         syncState,
         metricsSystem,
-        SyncTerminationCondition.never());
+        SyncTerminationCondition.never(),
+        SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
   }
 
   private ChainDownloader downloader() {

ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/fullsync/FullSyncChainDownloaderTotalTerminalDifficultyTest.java

@@ -31,6 +31,7 @@ import org.hyperledger.besu.ethereum.eth.sync.ChainDownloader;
 import org.hyperledger.besu.ethereum.eth.sync.SynchronizerConfiguration;
 import org.hyperledger.besu.ethereum.eth.sync.state.SyncState;
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.metrics.noop.NoOpMetricsSystem;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.plugin.services.storage.DataStorageFormat;
@@ -107,7 +108,8 @@ public class FullSyncChainDownloaderTotalTerminalDifficultyTest {
         ethContext,
         syncState,
         metricsSystem,
-        terminalCondition);
+        terminalCondition,
+        SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
   }
 
   private SynchronizerConfiguration.Builder syncConfigBuilder() {

ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/fullsync/FullSyncDownloaderTest.java

@@ -29,6 +29,7 @@ import org.hyperledger.besu.ethereum.eth.sync.SynchronizerConfiguration;
 import org.hyperledger.besu.ethereum.eth.sync.TrailingPeerRequirements;
 import org.hyperledger.besu.ethereum.eth.sync.state.SyncState;
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.metrics.noop.NoOpMetricsSystem;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.plugin.services.storage.DataStorageFormat;
@@ -96,7 +97,8 @@ public class FullSyncDownloaderTest {
         ethContext,
         syncState,
         metricsSystem,
-        SyncTerminationCondition.never());
+        SyncTerminationCondition.never(),
+        SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
   }
 
   @ParameterizedTest

ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/sync/snapsync/SnapWorldDownloadStateTest.java

@@ -46,6 +46,7 @@ import org.hyperledger.besu.ethereum.trie.forest.storage.ForestWorldStateKeyValu
 import org.hyperledger.besu.ethereum.worldstate.DataStorageConfiguration;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateKeyValueStorage;
 import org.hyperledger.besu.ethereum.worldstate.WorldStateStorageCoordinator;
+import org.hyperledger.besu.metrics.SyncDurationMetrics;
 import org.hyperledger.besu.metrics.noop.NoOpMetricsSystem;
 import org.hyperledger.besu.plugin.services.storage.DataStorageFormat;
 import org.hyperledger.besu.services.kvstore.InMemoryKeyValueStorage;
@@ -137,7 +138,8 @@ public class SnapWorldDownloadStateTest {
             MIN_MILLIS_BEFORE_STALLING,
             metricsManager,
             clock,
-            ethContext);
+            ethContext,
+            SyncDurationMetrics.NO_OP_SYNC_DURATION_METRICS);
     final DynamicPivotBlockSelector dynamicPivotBlockManager =
         mock(DynamicPivotBlockSelector.class);
     doAnswer(

metrics/core/src/main/java/org/hyperledger/besu/metrics/SyncDurationMetrics.java

@@ -0,0 +1,91 @@
+/*
+ * Copyright contributors to Hyperledger Besu.
+ *
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package org.hyperledger.besu.metrics;
+
+import org.hyperledger.besu.metrics.noop.NoOpMetricsSystem;
+import org.hyperledger.besu.plugin.services.MetricsSystem;
+import org.hyperledger.besu.plugin.services.metrics.LabelledMetric;
+import org.hyperledger.besu.plugin.services.metrics.OperationTimer;
+
+import java.util.HashMap;
+
+/**
+ * This class manages the synchronization duration metrics for the Hyperledger Besu project. It
+ * provides methods to start and stop timers for various synchronization phases.
+ */
+public class SyncDurationMetrics {
+
+  /** A {@link SyncDurationMetrics} instance that does not record any metrics. */
+  public static final SyncDurationMetrics NO_OP_SYNC_DURATION_METRICS =
+      new SyncDurationMetrics(new NoOpMetricsSystem());
+
+  private final LabelledMetric<OperationTimer> timer;
+
+  private final HashMap<String, OperationTimer.TimingContext> timers = new HashMap<>();
+
+  /**
+   * Creates a new {@link SyncDurationMetrics} instance.
+   *
+   * @param metricsSystem The {@link MetricsSystem} to use to record metrics.
+   */
+  public SyncDurationMetrics(final MetricsSystem metricsSystem) {
+    timer =
+        metricsSystem.createSimpleLabelledTimer(
+            BesuMetricCategory.SYNCHRONIZER, "sync_duration", "Time taken to sync", "name");
+  }
+
+  /**
+   * Starts a timer for the given synchronization phase.
+   *
+   * @param label The synchronization phase to start the timer for.
+   */
+  public void startTimer(final Labels label) {
+    timers.computeIfAbsent(label.name(), k -> timer.labels(label.name()).startTimer());
+  }
+
+  /**
+   * Stops the timer for the given synchronization phase.
+   *
+   * @param label The synchronization phase to stop the timer for.
+   */
+  public void stopTimer(final Labels label) {
+    OperationTimer.TimingContext context = timers.remove(label.name());
+    if (context != null) {
+      context.stopTimer();
+    }
+  }
+
+  /** Enum representing the different synchronization phases. */
+  public enum Labels {
+    /**
+     * Total time taken to get into sync. It is useful for SNAP and CHECKPOINT sync-modes only.
+     *
+     * <p>Total sync duration includes the separate stages mentioned below, some of which occur in
+     * parallel.
+     *
+     * <p>Total sync duration excludes the backwards sync stage due to implementation challenges.
+     * The backwards sync should be a very short duration following the other sync stages.
+     */
+    TOTAL_SYNC_DURATION,
+    /** Time taken to download the chain data (headers, blocks, receipts). */
+    CHAIN_DOWNLOAD_DURATION,
+    /** Time taken to download the initial world state, before the healing step. */
+    SNAP_INITIAL_WORLD_STATE_DOWNLOAD_DURATION,
+    /** Time taken to heal the world state, after the initial download. */
+    SNAP_WORLD_STATE_HEALING_DURATION,
+    /** Time taken to do the flat database heal. */
+    FLAT_DB_HEAL;
+  }
+}

metrics/core/src/main/java/org/hyperledger/besu/metrics/noop/NoOpMetricsSystem.java

@@ -104,6 +104,15 @@ public class NoOpMetricsSystem implements ObservableMetricsSystem {
     }
   }
 
+  @Override
+  public LabelledMetric<OperationTimer> createSimpleLabelledTimer(
+      final MetricCategory category,
+      final String name,
+      final String help,
+      final String... labelNames) {
+    return getOperationTimerLabelledMetric(labelNames.length);
+  }
+
   @Override
   public LabelledMetric<OperationTimer> createLabelledTimer(
       final MetricCategory category,

metrics/core/src/main/java/org/hyperledger/besu/metrics/opentelemetry/OpenTelemetrySystem.java

@@ -231,6 +231,15 @@ public class OpenTelemetrySystem implements ObservableMetricsSystem {
         });
   }
 
+  @Override
+  public LabelledMetric<OperationTimer> createSimpleLabelledTimer(
+      final MetricCategory category,
+      final String name,
+      final String help,
+      final String... labelNames) {
+    return createLabelledTimer(category, name, help, labelNames);
+  }
+
   @Override
   public LabelledMetric<OperationTimer> createLabelledTimer(
       final MetricCategory category,

metrics/core/src/main/java/org/hyperledger/besu/metrics/prometheus/PrometheusMetricsSystem.java

@@ -40,6 +40,7 @@ import io.prometheus.client.Collector.MetricFamilySamples;
 import io.prometheus.client.Collector.MetricFamilySamples.Sample;
 import io.prometheus.client.CollectorRegistry;
 import io.prometheus.client.Counter;
+import io.prometheus.client.Histogram;
 import io.prometheus.client.Summary;
 import io.prometheus.client.hotspot.BufferPoolsExports;
 import io.prometheus.client.hotspot.ClassLoadingExports;
@@ -139,6 +140,27 @@ public class PrometheusMetricsSystem implements ObservableMetricsSystem {
         });
   }
 
+  @Override
+  public LabelledMetric<OperationTimer> createSimpleLabelledTimer(
+      final MetricCategory category,
+      final String name,
+      final String help,
+      final String... labelNames) {
+    final String metricName = convertToPrometheusName(category, name);
+    return cachedTimers.computeIfAbsent(
+        metricName,
+        (k) -> {
+          if (timersEnabled && isCategoryEnabled(category)) {
+            final Histogram histogram =
+                Histogram.build(metricName, help).labelNames(labelNames).buckets(1D).create();
+            addCollectorUnchecked(category, histogram);
+            return new PrometheusSimpleTimer(histogram);
+          } else {
+            return NoOpMetricsSystem.getOperationTimerLabelledMetric(labelNames.length);
+          }
+        });
+  }
+
   @Override
   public void createGauge(
       final MetricCategory category,

metrics/core/src/main/java/org/hyperledger/besu/metrics/prometheus/PrometheusSimpleTimer.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright ConsenSys AG.
+ *
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package org.hyperledger.besu.metrics.prometheus;
+
+import org.hyperledger.besu.plugin.services.metrics.LabelledMetric;
+import org.hyperledger.besu.plugin.services.metrics.OperationTimer;
+
+import io.prometheus.client.Histogram;
+
+class PrometheusSimpleTimer implements LabelledMetric<OperationTimer> {
+
+  private final Histogram histogram;
+
+  public PrometheusSimpleTimer(final Histogram histogram) {
+    this.histogram = histogram;
+  }
+
+  @Override
+  public OperationTimer labels(final String... labels) {
+    final Histogram.Child metric = histogram.labels(labels);
+    return () -> metric.startTimer()::observeDuration;
+  }
+}

metrics/core/src/test-support/java/org/hyperledger/besu/metrics/StubMetricsSystem.java

@@ -75,6 +75,15 @@ public class StubMetricsSystem implements ObservableMetricsSystem {
     return labelValues -> NoOpMetricsSystem.NO_OP_OPERATION_TIMER;
   }
 
+  @Override
+  public LabelledMetric<OperationTimer> createSimpleLabelledTimer(
+      final MetricCategory category,
+      final String name,
+      final String help,
+      final String... labelNames) {
+    return labelValues -> NoOpMetricsSystem.NO_OP_OPERATION_TIMER;
+  }
+
   @Override
   public void createGauge(
       final MetricCategory category,

plugin-api/build.gradle

@@ -70,7 +70,7 @@ Calculated : ${currentHash}
 tasks.register('checkAPIChanges', FileStateChecker) {
   description = "Checks that the API for the Plugin-API project does not change without deliberate thought"
   files = sourceSets.main.allJava.files
-  knownHash = '2tFIKwEd8T5I37ywbFnVcMwTR8HiiCC6gO1Chd3hZp8='
+  knownHash = 'V/bdVbzJLjdwch266dHHuxIGwiCRhS4w3jDwHt4TWqg='
 }
 check.dependsOn('checkAPIChanges')
 

plugin-api/src/main/java/org/hyperledger/besu/plugin/services/MetricsSystem.java

@@ -89,6 +89,34 @@ public interface MetricsSystem extends BesuService {
   LabelledMetric<OperationTimer> createLabelledTimer(
       MetricCategory category, String name, String help, String... labelNames);
 
+  /**
+   * Creates a simple Timer.
+   *
+   * @param category The {@link MetricCategory} this timer is assigned to.
+   * @param name A name for this metric.
+   * @param help A human readable description of the metric.
+   * @return The created Timer instance.
+   */
+  default OperationTimer createSimpleTimer(
+      final MetricCategory category, final String name, final String help) {
+    return createSimpleLabelledTimer(category, name, help).labels();
+  }
+
+  /**
+   * Creates a simple Timer with assigned labels.
+   *
+   * @param category The {@link MetricCategory} this timer is assigned to.
+   * @param name A name for this metric.
+   * @param help A human readable description of the metric.
+   * @param labelNames An array of labels to assign to the Timer.
+   * @return The created Timer instance.
+   */
+  LabelledMetric<OperationTimer> createSimpleLabelledTimer(
+      final MetricCategory category,
+      final String name,
+      final String help,
+      final String... labelNames);
+
   /**
    * Creates a gauge for displaying double vales. A gauge is a metric to report the current value.
    * The metric value may go up or down.