add endpoint for heap stats

package.json

@@ -1,6 +1,6 @@
 {
   "name": "wiki-plugin-datalog",
-  "version": "0.1.7",
+  "version": "0.1.8",
   "description": "Federated Wiki - Datalog Plugin",
   "keywords": [
     "datalog",

server/server.js

@@ -3,10 +3,10 @@
 
 "use strict";
 
-
 (function() {
 
   const fs = require('fs')
+  const v8 = require('v8')
   const fetch = require("node-fetch")
   const exec = require('child_process').exec
   const events = require('events')
@@ -268,6 +268,10 @@
       })
     })
 
+    app.get('/plugin/datalog/heap', cors, (req, res) => {
+      res.json(v8.getHeapStatistics())
+    })
+
   }
 
   module.exports = {startServer}