Alright, so the first thing you need to do to keep an eye on your Firebase Realtime Database is to get into the Firebase Console. This is where all the magic happens, where you can see all the data and stats for your project. Just head over to https://console.firebase.google.com/, and log in with your Google account. Easy peasy.

Once you're in, pick your Firebase project from the list. Then, on the sidebar menu, find the 'Usage and Billing' section. This is your go-to spot for info about storage, downloads, and load data for your database.

In the 'Usage' tab under 'Usage and Billing', you'll get a detailed look at your database usage stats. You'll see things like 'Bytes Stored', 'Download Bytes', and 'Load' (which is basically the total number of connections to your database). This info is super handy for tracking usage and spotting any weird patterns.

Firebase has this neat tool called 'Performance Monitoring'. It helps you measure and analyze how well your app is doing. To use it, you need to add the Firebase Performance Monitoring SDK to your app.

Once you've got it set up, it starts collecting performance data from your app, processes it, and shows it in the Firebase console. You'll get insights on things like latency, network traffic, and how often HTTP requests are successful.

To check out the data from Performance Monitoring, go back to the Firebase Console. Look for the ‘Performance’ section on the left sidebar and click on it.

Here, you'll see an overview of your app's performance data, including real-time info on how your app is doing for users. You can dive deeper into the data by selecting different metrics in the filtering section, like durations, user traffic, and specific issues.

By following these steps, Firebase gives you all the tools you need to keep an eye on and analyze your Realtime Database usage and performance, helping you keep your apps running smoothly.