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CloudHealth recommends adding the following GCP Best Practice Policies for Financial Governance.
You can have greater control over your costs by benchmarking the cost of each GCP service month over month. If you have a large number of assets, this task can get overwhelming. So a best practice is to manage by exception. Start by identifying those services that changed by more that 20%.
Sample Service Cost Increase Policy: This policy alerts stakeholders when the Total Cost of your GCP bill increases by more than a certain percentage within the specified time interval.

Variants:
When your cloud costs are rising, it is critical to proactively identify cost variances by the offending functional business group. Perspectives allow you to quickly pinpoint problem spend areas and take action.
Examples
Sample Group Cost Increase Policy: This policy alerts stakeholders when the development environment costs exceeds a specific ($) amount. Use this policy to control or monitor month-over-month costs for a single service or across all services.

Set a budget and compare how your monthly spend is tracking with reference to that budget. CloudHealth customers can configure the policy to evaluate when MTD Actual Cost is within their budget, or when MTD Projected Cost is expected to exceed the budget.
Example: If MTD Cost > 100% of budget, then send email notification
Sample Over Budget Policy: This policy alerts stakeholders when the projected cost for the month is expected to be above the originally specified budget by a certain threshold. Use it to track your actual spend in comparison to your allocated budget.

Variants
Other Sample Policies for Cost Trends