Alert for credits amount used/remaining

If you mean free tier credit, this is how to set alerts https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/tracking-free-tier-usage.html

I'm afraid there's no current way of getting credit alerts natively. Depending on how critical this is for you, there's a few ways of accomplishing this but require different set ups as well as a potential cost. Cost Explorer Reports is probably the easiest, but wouldn't necessarily alert you, just provide you with the report.

In Cost Explorer, you create a report using the following Report Parameters first:

• Time
• • Date Range: Last month or three
• • Granularity: Monthly
• Group by
• • Dimension: Charge Type
• Optional, limit the Cost Category to Credits

You can save this report and be able to pull it up often, but if you wanted to have it emailed it'd required for you to use the Cost Explorer API, Lambda, and SES, for example: AWS-Cost-Explorer-Report.

You can either use Budget

or

1. Create a cost category where the charge type is not equal to credit.
2. Then in Cost anomaly detection create a monitor based on that cost category.

Hope it helps.