doc/04-OS-EOL.md: decide support level for Amazon Linux

[Al2Klimov]

Given https://endoflife.date/amazon-linux, I'd pick the Security Support for now.

Because in case of Standard Support, we'd support no versions of AL in 1/2 year.

In case of Security Support, we'd support only AL2023 in 1/2 year.

[bobapple]

I would pick with the Security Support.

[lippserd]

I would pick with the Security Support.

Sounds good to me too.

[Al2Klimov]

Damn, that page changed again😅, so that what we discussed doesn't matter for AL2. However, the Standard Support for AL2023 seems to end on Mar 15 now – before AL2. (Somewhat like CentOS 8 EOLed before v7.) I've set myself a reminder to re-check after Mar 15 how many supported AL versions are there.

[lippserd]

Damn, that page changed again😅

Of course it did:

Every major version release is supported by Standard Support for 2 years, followed by a maintenance phase of 3 years. Quarterly minor releases will be made during the Standard Support phase and include security updates, bug fixes, and new features and packages. Minor releases do not break backward-compatibility.

Also see https://docs.aws.amazon.com/linux/al2023/release-notes/relnotes.html

So that means that we have support Amazon Linux 2023.X.

[lippserd]

Or maybe not. I'm lost 😆. Are the 2023.X versions major releases or quarterly releases?

[lippserd]

Forget what I said. Those are indeed quarterly releases. So let's just wait for @Al2Klimov's reminder.

[Al2Klimov]

Generally speaking, at the moment each Linux Distro is listed in https://icinga.com/subscriptions/support-matrix/ with two or three latest versions. I consider this a good balance between the users' interests and ours. IMAO https://github.com/Icinga/icinga-packaging/blob/master/doc/04-OS-EOL.md#supported-release-cycles should be kept this way. That's what I'd focus on after Mar 15. Or maybe earlier if AL2025 gets released.