apollo_consensus_orchestrator: add SNIP-35 metrics

Author: sirandreww-starkware

crates/apollo_consensus_orchestrator/src/metrics.rs

@@ -32,6 +32,12 @@ define_metrics!(
         LabeledMetricCounter { CONSENSUS_BUILD_PROPOSAL_FAILURE , "consensus_build_proposal_failure", "Number of failures while building a proposal", init = 0, labels = BUILD_PROPOSAL_FAILURE_REASON },
         // Proposal validation failure metrics
         LabeledMetricCounter { CONSENSUS_VALIDATE_PROPOSAL_FAILURE , "consensus_validate_proposal_failure", "Number of failures while validating a proposal", init = 0, labels = VALIDATE_PROPOSAL_FAILURE_REASON },
+
+        // SNIP-35 dynamic gas pricing metrics
+        MetricGauge { SNIP35_FEE_ACTUAL, "snip35_fee_actual", "The current fee_actual (median of recent fee_proposals sliding window)" },
+        MetricGauge { SNIP35_FEE_PROPOSAL, "snip35_fee_proposal", "The fee_proposal this node published in the latest block" },
+        MetricGauge { SNIP35_FEE_TARGET, "snip35_fee_target", "The fee_target computed from the STRK/USD oracle" },
+        MetricGauge { SNIP35_STRK_USD_RATE, "snip35_strk_usd_rate", "The STRK/USD rate from the oracle" },
     }
 );
 
@@ -100,4 +106,8 @@ pub(crate) fn register_metrics() {
     CONSENSUS_BUILD_PROPOSAL_FAILURE.register();
     CONSENSUS_VALIDATE_PROPOSAL_FAILURE.register();
     CONSENSUS_PROOF_MANAGER_STORE_LATENCY.register();
+    SNIP35_FEE_ACTUAL.register();
+    SNIP35_FEE_PROPOSAL.register();
+    SNIP35_FEE_TARGET.register();
+    SNIP35_STRK_USD_RATE.register();
 }