My t3a.small instance credit report appears to be broken. Setting the CPU credit balance graph to 30s resolution reveals strange phenomenon with lines going from about 0.36 credits each 5 minutes to 576 credits one minute later: https://snipboard.io/YpX8tK.jpg
This also affects our own CloudWatch credit check implementation rendered in Zabbix: https://snipboard.io/45GR9i.jpg
I've already tried to reboot the instance, but the issue persists.
Thanks for help.