feat: Add metrics to track transactions by type in txpool

crates/transaction-pool/src/metrics.rs

@@ -36,8 +36,18 @@ pub struct TxPoolMetrics {
     /// Total amount of memory used by the transactions in the blob sub-pool in bytes
     pub(crate) blob_pool_size_bytes: Gauge,
 
-    /// Number of all transactions of all sub-pools: pending + basefee + queued
+    /// Number of all transactions of all sub-pools: pending + basefee + queued + blob
     pub(crate) total_transactions: Gauge,
+    /// Number of all legacy transactions in the pool
+    pub(crate) total_legacy_transactions: Gauge,
+    /// Number of all EIP-2930 transactions in the pool
+    pub(crate) total_eip2930_transactions: Gauge,
+    /// Number of all EIP-1559 transactions in the pool
+    pub(crate) total_eip1559_transactions: Gauge,
+    /// Number of all EIP-4844 transactions in the pool
+    pub(crate) total_eip4844_transactions: Gauge,
+    /// Number of all EIP-7702 transactions in the pool
+    pub(crate) total_eip7702_transactions: Gauge,
 
     /// How often the pool was updated after the canonical state changed
     pub(crate) performed_state_updates: Counter,

crates/transaction-pool/src/pool/txpool.rs

@@ -19,8 +19,12 @@ use crate::{
     ValidPoolTransaction, U256,
 };
 use alloy_primitives::{Address, TxHash, B256};
-use reth_primitives::constants::{
-    eip4844::BLOB_TX_MIN_BLOB_GASPRICE, ETHEREUM_BLOCK_GAS_LIMIT, MIN_PROTOCOL_BASE_FEE,
+use reth_primitives::{
+    constants::{
+        eip4844::BLOB_TX_MIN_BLOB_GASPRICE, ETHEREUM_BLOCK_GAS_LIMIT, MIN_PROTOCOL_BASE_FEE,
+    },
+    EIP1559_TX_TYPE_ID, EIP2930_TX_TYPE_ID, EIP4844_TX_TYPE_ID, EIP7702_TX_TYPE_ID,
+    LEGACY_TX_TYPE_ID,
 };
 use rustc_hash::FxHashMap;
 use smallvec::SmallVec;
@@ -429,6 +433,7 @@ impl<T: TransactionOrdering> TxPool<T> {
 
         let UpdateOutcome { promoted, discarded } = self.update_accounts(changed_senders);
 
+        self.update_transaction_type_metrics();
         self.metrics.performed_state_updates.increment(1);
 
         OnNewCanonicalStateOutcome { block_hash, mined: mined_transactions, promoted, discarded }
@@ -448,6 +453,32 @@ impl<T: TransactionOrdering> TxPool<T> {
         self.metrics.total_transactions.set(stats.total as f64);
     }
 
+    /// Updates transaction type metrics for the entire pool.
+    pub(crate) fn update_transaction_type_metrics(&self) {
+        let mut legacy_count = 0;
+        let mut eip2930_count = 0;
+        let mut eip1559_count = 0;
+        let mut eip4844_count = 0;
+        let mut eip7702_count = 0;
+
+        for tx in self.all_transactions.transactions_iter() {
+            match tx.transaction.tx_type() {
+                LEGACY_TX_TYPE_ID => legacy_count += 1,
+                EIP2930_TX_TYPE_ID => eip2930_count += 1,
+                EIP1559_TX_TYPE_ID => eip1559_count += 1,
+                EIP4844_TX_TYPE_ID => eip4844_count += 1,
+                EIP7702_TX_TYPE_ID => eip7702_count += 1,
+                _ => {} // Ignore other types
+            }
+        }
+
+        self.metrics.total_legacy_transactions.set(legacy_count as f64);
+        self.metrics.total_eip2930_transactions.set(eip2930_count as f64);
+        self.metrics.total_eip1559_transactions.set(eip1559_count as f64);
+        self.metrics.total_eip4844_transactions.set(eip4844_count as f64);
+        self.metrics.total_eip7702_transactions.set(eip7702_count as f64);
+    }
+
     /// Adds the transaction into the pool.
     ///
     /// This pool consists of four sub-pools: `Queued`, `Pending`, `BaseFee`, and `Blob`.