What is Amazon Linux package's versioning semantic

I've recently upgraded Amazon Linux 2 middlewear.

We've realized that Nginx was upgraded from

nginx-1.22.1-1.amzn2.0.2.x86_64 to nginx-1.22.1-1.amzn2.0.3.x86_64

What does this amzn2.0.2 to amzn2.0.3 means?

I am aware that 1st amzn2 stands for Amazon Linux 2. How does Amazon operate versioning semantic of next two digit numbers?

Thanks.