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Thread on the jdk8u-dev list asking about objections, concerns about this early removal. I haven't heard back in a couple of days, so pushed it to 8u302.
https://mail.openjdk.java.net/pipermail/jdk8u-dev/2021-March/013568.html
22-03-2021
We've added warnings for weak keys only in 8u292 via JDK-8172404. Currently targeting 8u302 even though this would give users only one release to adjust. OpenJDK 11 added the warning with 11.0.9 and removed them with 11.0.12. We can reconsider at a later point if we should include it with 8u302 or wait for 8u312 or 8u322.