Adding diag report

Author: donovanh

diagnostics/index.md

@@ -196,11 +196,20 @@ Find more information on [debugging using ndb](https://github.com/GoogleChromeLa
 
 ## Generating diagnostic reports
 
-Sometimes we need more information to work out what is going on. To help with this, we can make use of Node's built-in `diagnostic report` feature:
+Sometimes we need more information to work out what is going on. To help with this, we can make use of Node's built-in [diagnostic report](https://nodejs.org/api/report.html) feature.
 
-https://nodejs.org/dist/latest-v11.x/docs/api/report.html
+To create the report, we can run the following command against out `count.js` file above:
 
-> With the report option enabled, diagnostic reports can be triggered on unhandled exceptions, fatal errors and user signals, in addition to triggering programmatically through API calls.
+```
+node --report-uncaught-exception count.js
+```
+
+This generates [a report in JSON](/diagnostics/report.20210505.160745.11097.0.001.json) that you can read to try to work out what has happened.
+
+
+
+
+With the report option enabled, diagnostic reports can be triggered on unhandled exceptions, fatal errors and user signals, in addition to triggering programmatically through API calls. Read more on the official [diagnostic report docs page](https://nodejs.org/api/report.html).
 
 
 ## Async hooks