Thanks for asking question! As mentioned by AndriyBilous Yes, You can access App Service Plan density.
Further to clarify on App Service and App Service plan you may want to know that for creating an App an App Service plan is required which is a set of compute resource assigned to run your App Service.
The pricing tier (Basic, Standard, Premium) of your App Service plan determines the compute power and features you get and when you deploy multiple App Services in the same App Service plan, they all share the underlying compute resources.
Also, for production applications, it is recommended that an App Service Plan does not host more than a certain number of sites and the app Service Plan Density checks for overstuffed App Service Plans and beeps if it finds that you have too many apps in the same app service plan. Its first thing to see Memory Analysis or Memory related issue.
You may refer to Azure App Service plan overview
Hope this helps. Let us know if further query or issue remains.