Add more info to diagnostics endpoint

lib/www/server/lib/diagnostics.js

@@ -1,3 +1,4 @@
+const os = require('os');
 const { statfs } = require('fs').promises;
 const { pool } = require('./db/connection');
 const cfg = require('./config');
@@ -75,6 +76,15 @@ async function diagnostics () {
 		data[path] = await df(paths[path]);
 	}
 	const res = {
+		hostname: os.hostname(),
+		memory: {
+			total: os.totalmem(),
+			free: os.freemem()
+		},
+		uptime: os.uptime(),
+		loadavg: os.loadavg(),
+		networkInterfaces: os.networkInterfaces(),
+		cpus: os.cpus(),
 		storage: {
 			root: await df("/"),
 			data