added metric

core/node/consensus/Cargo.toml

@@ -42,6 +42,7 @@ thiserror.workspace = true
 tracing.workspace = true
 tokio.workspace = true
 semver.workspace = true
+vise.workspace = true
 
 [dev-dependencies]
 zksync_node_genesis.workspace = true

core/node/consensus/src/en.rs

@@ -17,6 +17,7 @@ use zksync_web3_decl::{
 
 use super::{config, storage::Store, ConsensusConfig, ConsensusSecrets};
 use crate::{
+    metrics::METRICS,
     registry,
     storage::{self, ConnectionPool},
 };
@@ -367,6 +368,7 @@ impl EN {
     ) -> ctx::Result<FetchedBlock> {
         const RETRY_INTERVAL: time::Duration = time::Duration::seconds(5);
         let n = L2BlockNumber(n.0.try_into().context("overflow")?);
+        METRICS.fetch_block.inc();
         loop {
             match ctx.wait(self.client.sync_l2_block(n, true)).await? {
                 Ok(Some(block)) => return Ok(block.try_into()?),

core/node/consensus/src/lib.rs

@@ -9,6 +9,7 @@ mod abi;
 mod config;
 mod en;
 pub mod era;
+mod metrics;
 mod mn;
 mod registry;
 mod storage;

core/node/consensus/src/metrics.rs

@@ -0,0 +1,13 @@
+//! Consensus related metrics.
+
+#[derive(Debug, vise::Metrics)]
+#[metrics(prefix = "zksync_node_consensus")]
+pub(crate) struct Metrics {
+    /// Number of blocks that has been fetched via JSON-RPC.
+    /// It is used only as a fallback when the p2p syncing is disabled or falling behind.
+    /// so it shouldn't be increasing under normal circumstances if p2p syncing is enabled.
+    pub fetch_block: vise::Counter,
+}
+
+#[vise::register]
+pub(super) static METRICS: vise::Global<Metrics> = vise::Global::new();