feat/cleanup report

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - added contender version to bottom of reports ([#452](https://github.com/flashbots/contender/pull/452/changes))
 - enable custom data dir at runtime ([453](https://github.com/flashbots/contender/pull/453/changes))
+- clean up html report UI, support batched `eth_sendRawTransaction` latency metrics ([#455](https://github.com/flashbots/contender/pull/455))
 
 ## [0.8.1](https://github.com/flashbots/contender/releases/tag/v0.8.1) - 2026-02-09
 

crates/cli/src/default_scenarios/fill_block.rs

@@ -51,7 +51,20 @@ pub async fn fill_block(
         block_gas_limit.unwrap_or(30_000_000)
     };
 
-    let num_txs = txs_per_block.unwrap_or(txs_per_second.unwrap_or_default());
+    let num_txs = match (txs_per_block, txs_per_second) {
+        (Some(0), _) | (_, Some(0)) => {
+            return Err(CliError::Args(
+                crate::commands::error::ArgsError::SpamRateNotFound,
+            ));
+        }
+        (Some(n), _) => n,
+        (_, Some(n)) => n,
+        (None, None) => {
+            return Err(CliError::Args(
+                crate::commands::error::ArgsError::SpamRateNotFound,
+            ));
+        }
+    };
     let gas_per_tx = gas_limit / num_txs;
 
     info!("Attempting to fill blocks with {gas_limit} gas; sending {num_txs} txs, each with gas limit {gas_per_tx}.");

crates/core/src/test_scenario.rs

@@ -1123,6 +1123,7 @@ where
                 })
                 .collect();
 
+            let hist = self.prometheus.hist.get();
             tasks.push(tokio::task::spawn(async move {
                 // Build json-rpc batch payload with multiple eth_sendRawTransaction requests
                 let mut requests = Vec::with_capacity(signed_chunk.len());
@@ -1138,9 +1139,23 @@ where
                     }));
                 }
 
+                // === PROMETHEUS LATENCY METRICS ===
+                let mut timer = hist.as_ref().map(|h| {
+                    h.with_label_values(&["eth_sendRawTransaction"])
+                        .start_timer()
+                });
+
                 let resp = match http_client.post(rpc_url).json(&requests).send().await {
-                    Ok(r) => r,
+                    Ok(r) => {
+                        if let Some(t) = timer.take() {
+                            t.observe_duration()
+                        }
+                        r
+                    }
                     Err(e) => {
+                        if let Some(t) = timer.take() {
+                            t.observe_duration()
+                        }
                         warn!("failed to send JSON-RPC batch: {e:?}");
                         return;
                     }

crates/report/CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - added contender version to bottom of reports ([#452](https://github.com/flashbots/contender/pull/452/changes))
 - use `std::path::Path` instead of `str` where applicable ([453](https://github.com/flashbots/contender/pull/453/changes))
+- clean up html report UI, support batched `eth_sendRawTransaction` latency metrics ([#455](https://github.com/flashbots/contender/pull/455/changes))
 
 ## [0.8.1](https://github.com/flashbots/contender/releases/tag/v0.8.1) - 2026-02-09
 

crates/report/src/block_trace.rs

@@ -139,12 +139,11 @@ pub async fn get_block_traces(
 ) -> Result<Vec<TxTraceReceipt>> {
     // get tx traces for all txs in all_blocks
     let mut all_traces = vec![];
-    if full_blocks.is_empty() {
+    let total_txs: usize = full_blocks.iter().map(|b| b.transactions.len()).sum();
+    if full_blocks.is_empty() || total_txs == 0 {
         return Ok(all_traces);
     }
-    let (sender, mut receiver) = tokio::sync::mpsc::channel::<TxTraceReceipt>(
-        full_blocks.iter().map(|b| b.transactions.len()).sum(),
-    );
+    let (sender, mut receiver) = tokio::sync::mpsc::channel::<TxTraceReceipt>(total_txs);
 
     for block in full_blocks {
         let mut tx_tasks = vec![];

crates/report/src/template.html.handlebars

@@ -337,10 +337,20 @@
       .map(slot => `0x${slot.slice(0,4)}...${slot.slice(-4)}`);
       const data = {{data.chart_data.heatmap.matrix}};
 
+      // Pre-compute total writes per slot (y-axis index)
+      const slotTotals = new Array(storageSlots.length).fill(0);
+      data.forEach(function(entry) {
+        slotTotals[entry[1]] += entry[2];
+      });
+
       // Specify the configuration items and data for the chart
       var option = {
         tooltip: {
-          position: 'top'
+          position: 'top',
+          formatter: function(params) {
+            const slotIdx = params.value[1];
+            return `${storageSlots[slotIdx]}<br/>Block: ${blocks[params.value[0]]}<br/>Writes: ${params.value[2]}<br/>Total slot writes: ${slotTotals[slotIdx]}`;
+          }
         },
         grid: {
           height: '70%',
@@ -380,10 +390,7 @@
           type: 'heatmap',
           data: data,
           label: {
-            show: true,
-            formatter: function (params) {
-              return params.value[2] > 0 ? params.value[2] : '-';
-            }
+            show: false
           },
           emphasis: {
             itemStyle: {
@@ -466,9 +473,9 @@
           data: buckets,
           nameGap: 2,
           axisLabel: {
-            interval: 0,
+            interval: buckets.length > 20 ? Math.floor(buckets.length / 20) - 1 : 0,
             rotate: 45
-          }
+          },
         },
         yAxis: {
           type: 'value',