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server.pendingRequests and server.pendingWebSockets

Monitor server activity with built-in counters: 
const server = Bun.serve({
	fetch(req, server) {
		return new Response(
			`Active requests: ${server.pendingRequests}\n` +
				`Active WebSockets: ${server.pendingWebSockets}`,
		);
	},
});

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server.subscriberCount(topic)

Get count of subscribers for a WebSocket topic: 
const server = Bun.serve({
	fetch(req, server) {
		const chatUsers = server.subscriberCount('chat');
		return new Response(`${chatUsers} users in chat`);
	},
	websocket: {
		message(ws) {
			ws.subscribe('chat');
		},
	},
});
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