[subsystem-benchmarks] Save results to json

polkadot/node/network/availability-recovery/benches/availability-recovery-regression-bench.rs

@@ -61,6 +61,7 @@ fn main() -> Result<(), String> {
 	messages.extend(usage.check_cpu_usage(&[("availability-recovery", 11.500, 0.05)]));
 
 	if messages.is_empty() {
+		usage.save_as_json("charts.json").map_err(|e| e.to_string())?;
 		Ok(())
 	} else {
 		eprintln!("{}", messages.join("\n"));

polkadot/node/subsystem-bench/Cargo.toml

@@ -71,6 +71,7 @@ prometheus_endpoint = { package = "substrate-prometheus-endpoint", path = "../..
 prometheus = { version = "0.13.0", default-features = false }
 serde = { workspace = true, default-features = true }
 serde_yaml = { workspace = true }
+serde_json = { workspace = true }
 
 polkadot-node-core-approval-voting = { path = "../core/approval-voting" }
 polkadot-approval-distribution = { path = "../network/approval-distribution" }

polkadot/node/subsystem-bench/src/lib/environment.rs

@@ -403,7 +403,7 @@ impl TestEnvironment {
 		let total_cpu = test_env_cpu_metrics.sum_by("substrate_tasks_polling_duration_sum");
 
 		usage.push(ResourceUsage {
-			resource_name: "Test environment".to_string(),
+			resource_name: "test-environment".to_string(),
 			total: total_cpu,
 			per_block: total_cpu / num_blocks,
 		});

polkadot/node/subsystem-bench/src/lib/usage.rs

@@ -18,7 +18,8 @@
 
 use colored::Colorize;
 use serde::{Deserialize, Serialize};
-use std::collections::HashMap;
+use serde_json::json;
+use std::{collections::HashMap, fs::File, io::Write};
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct BenchmarkUsage {
@@ -75,6 +76,44 @@ impl BenchmarkUsage {
 			_ => None,
 		}
 	}
+
+	pub fn save_as_json(&self, path: &str) -> std::io::Result<()> {
+		let mut file = File::create(path)?;
+		file.write_all(self.to_json().as_bytes())?;
+		Ok(())
+	}
+
+	fn to_json(&self) -> String {
+		let mut res: Vec<String> = vec![];
+		res.extend(
+			self.network_usage
+				.iter()
+				.map(|v| {
+					json!({
+						"name": v.resource_name,
+						"unit": "KiB",
+						"value": v.per_block
+					})
+					.to_string()
+				})
+				.collect::<Vec<_>>(),
+		);
+		res.extend(
+			self.cpu_usage
+				.iter()
+				.map(|v| {
+					json!({
+						"name": v.resource_name,
+						"unit": "seconds",
+						"value": v.per_block
+					})
+					.to_string()
+				})
+				.collect::<Vec<_>>(),
+		);
+
+		format!("[{}]", res.join(","))
+	}
 }
 
 fn check_usage(