add account_updates_per_second to metrics

src/core/metrics.ts

@@ -39,6 +39,7 @@ enum METRIC_TYPES {
 	endpoint_response_status = 'endpoint_response_status',
 	gpa_fetch_duration = 'gpa_fetch_duration',
 	last_ws_message_received_ts = 'last_ws_message_received_ts',
+	account_updates_per_sec = 'account_updates_per_sec',
 	current_system_ts = 'current_system_ts',
 	health_status = 'health_status',
 }
@@ -125,6 +126,20 @@ lastWsReceivedTsGauge.addCallback((obs: ObservableResult) => {
 	obs.observe(lastWsMsgReceivedTs, {});
 });
 
+let lastAccountUpdatesPerSecond = 0;
+const setAccountUpdatesPerSecond = (updatesPerSecond: number) => {
+	lastAccountUpdatesPerSecond = updatesPerSecond;
+};
+const accountUpdatesPerSecondGauge = meter.createObservableGauge(
+	METRIC_TYPES.account_updates_per_sec,
+	{
+		description: 'Updates per second, the last second',
+	}
+);
+accountUpdatesPerSecondGauge.addCallback((obs: ObservableResult) => {
+	obs.observe(lastAccountUpdatesPerSecond, {});
+});
+
 const currentSystemTsGauge = meter.createObservableGauge(
 	METRIC_TYPES.current_system_ts,
 	{
@@ -229,4 +244,5 @@ export {
 	responseStatusCounter,
 	handleHealthCheck,
 	setLastReceivedWsMsgTs,
+	setAccountUpdatesPerSecond as setLastAccountUpdatesPerSecond,
 };

src/index.ts

@@ -38,6 +38,7 @@ import * as http from 'http';
 import {
 	gpaFetchDurationHistogram,
 	handleHealthCheck,
+	setLastAccountUpdatesPerSecond,
 	setLastReceivedWsMsgTs,
 } from './core/metrics';
 import { handleResponseTime } from './core/middleware';
@@ -254,6 +255,7 @@ const main = async () => {
 			};
 		}
 
+		let updatesPerTenSecond = 0;
 		const orderSubscriber = new OrderSubscriber({
 			driftClient,
 			subscriptionConfig,
@@ -262,8 +264,13 @@ const main = async () => {
 			'updateReceived',
 			(_pubkey: PublicKey, _slot: number, _dataType: 'raw' | 'decoded') => {
 				setLastReceivedWsMsgTs(Date.now());
+				updatesPerTenSecond++;
 			}
 		);
+		setInterval(() => {
+			setLastAccountUpdatesPerSecond(updatesPerTenSecond / 10);
+			updatesPerTenSecond = 0;
+		}, 10_000);
 
 		dlobProvider = getDLOBProviderFromOrderSubscriber(orderSubscriber);