The policies for AWS and Azure cost and usage information will compare "3 days prior to 2 days prior" as we assume partial data for yesterday. Cost policies will NOT be evaluating the prior day of partial data. It will skip over that day.
For example, if today is February 7th and a policy is designed to evaluate on a daily cost increase, CloudHealth will compare the first two days of full data. Due to the previous day (Feb 6th) having partial data, the policy will evaluate metrics from February 5th and February 4th. Policies will also only trigger if costs appear in all appropriate accounts referenced in the policy.