# CloudWatch RUM for all insights
[CloudWatch RUM](https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-RUM.html) was recently launched during re:Invent 2021 which provides insights to your web-application about certain metrics based on user-actions and errors for debugging.
You can read about the [announcement](https://aws.amazon.com/about-aws/whats-new/2021/11/amazon-cloudwatch-rum-applications-client-side-performance/).
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### Key takeways from the blog
+ [Understanding CloudWatch RUM ](#understanding-rum)
+ [Setting-up RUM](#setting-up-rum)
+ [Different telemetry data](#data)
### Understanding CloudWatch RUM
**CloudWatch Real-User Monitoring (RUM)** is a monitoring functionality facilitated by CloudWatch which has always been the monitoring tool on AWS. RUM enables developers and DevOps engineers to understand the issues/errors encountered on the web-app and also insights such as which *device* or *browser* or *location* had the error. Additionally, there is performance insights and the time taken for a file to load on the client side along with the geographically information.
As [Jeff Barr](https://twitter.com/jeffbarr) quotes it, it's that simple to implement on the client side.
> You simply register your application, add a snippet of JavaScript to the header of each page, and deploy.
The **CloudWatch RUM** consolidated and provides dashboard which gives you a detailed insights such as - *page load speed*, *geographic info*, *devices*, *browsers*, *average load during the time*, *user journey*. All this with just a snippet of JS to page.
### Setting-up RUM
**CloudWatch Real-User Monitoring (RUM)** setup can be summarized with the 3 steps -
+ [Add app monitor](#add-app)
+ [Adding the JS snippet to your web app](#snippet)
+ [Monitor the web-app from CloudWatch console](#monitoring)
#### Add app monitor
While adding a new app monitor, you would have to specify details such as - *app monitor name*, *app domain* and an option to include the sub-domains of the *app domain*.
You can choose what all data is been collected and stored as telemetry data for the dashboards.
The telemetry data is stored only for *30 days*, so if you would wish to store the logs, you can create a CloudWatch log event which captures and stores all these datas.
CloudWatch RUM needs authorization to access AWS resources, for which Amazon Cognito Identity Pools are used.
The telemetry data of the web-pages can also be fine grained to the choice of *all pages*, *specific pages only* or *exclude certain pages*.
#### Adding the JS snippet to your web app
Once you save the configurations and add the app monitor, you would be presented with a JavaScript snippet.
As simple as it is, this just needs to be added to the `` of your web-page which is sending telemetry data using the `