RHEL
English:
https://access.redhat.com/support/policy/updates/errata/#Extended_Life_Cycle_Phase
Chinese:
https://access.redhat.com/zh_CN/support/policy/updates/errata#Extended_Life_Cycle_Phase
openSUSE
English:
https://en.opensuse.org/Lifetime
Chinese:
https://zh.opensuse.org/%E4%BD%BF%E7%94%A8%E6%9C%9F%E9%99%90
SLE
https://www.suse.com/lifecycle