refactor(CLI): Introduce modern warning about resource limit

lib/plugins/aws/info/index.js

@@ -8,6 +8,7 @@ const getStackInfo = require('./getStackInfo');
 const getResourceCount = require('./getResourceCount');
 const getApiKeyValues = require('./getApiKeyValues');
 const display = require('./display');
+const { log } = require('@serverless/utils/log');
 
 const mainProgress = progress.get('main');
 
@@ -72,6 +73,18 @@ class AwsInfo {
       'aws:info:displayStackOutputs': async () =>
         BbPromise.bind(this).then(this.displayStackOutputs),
 
+      'after:aws:info:gatherData': () => {
+        if (this.gatheredData.info.resourceCount >= 450) {
+          log.warning(
+            `You have ${
+              this.gatheredData.info.resourceCount
+            } resources in your service. CloudFormation has a hard limit of 500 resources in a service. For advice on avoiding this limit, check out this link: ${style.link(
+              'http://slss.io/2q2'
+            )}.`
+          );
+        }
+      },
+
       'finalize': () => {
         if (this.serverless.processedInput.commands.join(' ') !== 'info') return;