Thanks for reaching out to us with this query.
Investigating on this, I found that there was a known issue with the t3a instance types where they were not showing up the CPUCreditUsage and CPUCreditBalance metrics in the Monitoring tab of the instance. Our internal service team actively worked on this to get it resolved and now, you should be able to see the metrics.
Moreover, when I checked the metrics of my test t3a instance, I was able to see the CPUCreditUsage and CPUCreditBalance metrics under the monitoring tab of the instance.
Please let us know if you have any further queries on this.
Thank you and Have a good one!
I can see that this bug is now fixed.
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