Added health check endpoint.

app.js

 const fs = require('fs');
 const express = require('express');
+const actuator = require('express-actuator');
 const bodyParser = require('body-parser');
 const cors = require('cors');
 const config = require('./load-config');
@@ -25,6 +26,8 @@ app.get('/mode', (req, res) => {
   res.send(config.mode);
 });
 
+app.use(actuator()); // Provides /health, /metrics, /info
+
 // The web frontend
 app.use(express.static(__dirname + '/node_modules/@actual-app/web/build'));
 app.get('/*', (req, res) => {

package.json

@@ -17,6 +17,7 @@
     "body-parser": "^1.18.3",
     "cors": "^2.8.5",
     "express": "^4.16.3",
+    "express-actuator": "^1.8.1",
     "express-response-size": "^0.0.3",
     "node-fetch": "^2.2.0",
     "uuid": "^3.3.2"