add metrics for latency apart from utilisation

mysticeti-core/src/crypto.rs

@@ -189,6 +189,7 @@ impl PublicKey {
  let _timer = metrics
  .utilization_timer
  .utilization_timer("PublicKey::verify_block");
+ let _latency_timer = metrics.verify_block_latency.start_timer();
  let signature = Ed25519Signature::from_bytes(block.signature().as_bytes())
  .expect("Failed to convert signature");
  let mut hasher = BlockHasher::default();
@@ -244,6 +245,7 @@ impl Signer {
  let _timer = metrics
  .utilization_timer
  .utilization_timer("Signer::sign_block");
+ let _latency_timer = metrics.sign_block_latency.start_timer();
  let signature = self.0.sign(digest.as_ref());
  SignatureBytes(
  signature

mysticeti-core/src/metrics.rs

@@ -84,6 +84,8 @@ pub struct Metrics {
  pub add_block_latency: HistogramVec,
  pub quorum_receive_latency: Histogram,
  pub ready_new_block: IntCounterVec,
+ pub sign_block_latency: Histogram,
+ pub verify_block_latency: Histogram,
 }
 
 pub struct MetricReporter {
@@ -406,6 +408,18 @@ impl Metrics {
  registry,
  ).unwrap(),
 
+ sign_block_latency: register_histogram_with_registry!(
+ "sign_block_latency",
+ "The time it takes to sign a block",
+ registry
+ ).unwrap(),
+
+ verify_block_latency: register_histogram_with_registry!(
+ "verify_block_latency",
+ "The time it takes to verify a block",
+ registry
+ ).unwrap(),
+
  transaction_certified_latency,
  certificate_committed_latency,
  transaction_committed_latency,