feat: log memory on 10s interval

index.js

@@ -1,6 +1,7 @@
 module.exports = wip
 
 const sendLogs = require('./lib/logs/send')
+const logMemoryUsage = require('./lib/logs/memory-usage.js')
 const handlePullRequestChange = require('./lib/handle-pull-request-change')
 const handleRequestedAction = require('./lib/handle-requested-action')
 const handleMarketplacePurchase = require('./lib/handle-marketplace-purchase')
@@ -22,4 +23,5 @@ function wip (app) {
   app.on('marketplace_purchase', handleMarketplacePurchase.bind(null, app))
 
   sendLogs(app)
+  logMemoryUsage(app)
 }

lib/logs/memory-usage.js

@@ -0,0 +1,20 @@
+/* istanbul ignore file */
+module.exports = logMemoryUsage
+
+let lastMemory = {
+  rss: 0,
+  heapTotal: 0,
+  heapUsed: 0,
+  external: 0
+}
+
+/* istanbul ignore next */
+function logMemoryUsage (app) {
+  const interval = 10000 // 10s
+  setInterval(() => {
+    const usage = process.memoryUsage()
+    const diff = usage.rss - lastMemory.rss
+    app.log.debug(usage, `Memory usage change: ${diff}`)
+    lastMemory = usage
+  }, interval) // 10s
+}