Which AWS tool provides this functionality?
AWS Cost Explorer
AWS Budgets
Cost allocation tags
AWS Cost and Usage Reports
Explanations:
AWS Cost Explorer is primarily used for visualizing and analyzing costs but does not provide alerting functionality for cost thresholds.
AWS Budgets allows users to set custom cost and usage budgets and provides alerts when actual or forecasted costs exceed the specified thresholds.
Cost allocation tags help categorize and track costs but do not provide alerting mechanisms for budget thresholds.
AWS Cost and Usage Reports provide detailed billing information but do not offer functionality for setting alerts based on costs.