restored metrics

node/actors/bft/src/metrics.rs

@@ -68,6 +68,8 @@ pub(crate) struct ConsensusMetrics {
     /// Latency of processing messages by the leader.
     #[metrics(buckets = Buckets::LATENCIES, unit = Unit::Seconds)]
     pub(crate) leader_processing_latency: Family<ProcessingLatencyLabels, Histogram<Duration>>,
+    /// Number of the last finalized block observed by the node.
+    pub(crate) finalized_block_number: Gauge<u64>,
 }
 
 /// Global instance of [`ConsensusMetrics`].

node/actors/bft/src/replica/block.rs

@@ -41,6 +41,11 @@ impl StateMachine {
         self.storage
             .put_block(ctx, &block)
             .await
-            .context("store.put_block()")
+            .context("store.put_block()")?;
+
+        let number_metric = &crate::metrics::METRICS.finalized_block_number;
+        let current_number = number_metric.get();
+        number_metric.set(current_number.max(block.header.number.0));
+        Ok(())
     }
 }

node/actors/executor/src/lib.rs

@@ -13,7 +13,6 @@ use zksync_consensus_utils::pipe;
 
 mod config;
 mod io;
-mod metrics;
 pub mod testonly;
 #[cfg(test)]
 mod tests;