This Node.js script gets the Azure billing information for a subscription, sum it per resource group and places it as a tag on each resource group.
Usage:
1 - Install node.js
2 - Create a service principle
3 - Set the billing start date (you can make this auto calculate). The end date will be computed to the current date.
4 - Set you Azure subscription pricing: https://azure.microsoft.com/en-us/support/legal/offer-details/ in the “offer” variable Run the script
Optionally - set some policies around the data (Note: this script is not a foolproof way to cap Azure spending)
5 - Optional: Create a new tag in each resource group (e.g. maxSpend = 10000)
6 - Optional: Create a policy that compares billingSpend to maxSpend and throw an error if it is too high when new resources are attempted to be created.