[INFRA-2615] Deprecate fixed tiers, don't generate for 2.249.x+

[daniel-beck]

This implements the suggestion in jenkinsci/docker#954 (comment) and will result in the gradual retirement of fixed tiers.

Currently, all five latest fixed tiers are still generated for tools and scripts accessing them directly. With 2.249.x coming in ~5 weeks, 2.176.x will be retired, but 2.249.x would not be added with this change. This would continue until, after about a year, no fixed tiers are generated anymore.

jenkinsci/docker#954 should be implemented so the Docker image doesn't require these directories anymore. CC @slide

[timja]

This implements the suggestion in jenkinsci/docker#954 (comment) and will result in the gradual retirement of fixed tiers.

Currently, all five latest fixed tiers are still generated for tools and scripts accessing them directly. With 2.249.x coming in ~5 weeks, 2.176.x will be retired, but 2.249.x would not be added with this change. This would continue until, after about a year, no fixed tiers are generated anymore.

jenkinsci/docker#954 should be implemented so the Docker image doesn't require these directories anymore. CC @slide

jenkinsci/docker#954 has been implemented in the plugin installation manager tool, I doubt there's a plan to update the install-plugins script as well.

[daniel-beck]

I doubt there's a plan to update the install-plugins script as well.

Isn't that what jenkinsci/docker#964 does?

[timja]

isn't there still issues with it? and ref: jenkinsci/docker#964 (comment)

[daniel-beck]

For now we'll continue to support the part that relies on the existence of tiered latest/ dirs, tracked as jenkinsci/docker#953