Reminder: file JDK 21 CSRs well ahead of June 8, 2023 rampdown 1 start

[Joseph D. Darcy]

Hello,

Per the JDK 21 schedule (https://openjdk.org/projects/jdk/21/), the 
rampdown 1 of JDK 23 starts on June 8, 2023, about eight weeks from today.

An advanced reminder to factor in sufficient review time for any 
projects needing CSR review before getting pushed into JDK 21, which 
includes JEPs. Large projects, including JEPs, should often use the 
two-phase CSR process (https://wiki.openjdk.java.net/display/csr/Main) 
rather than the one-phase process. The nominal SLA for each CSR phase is 
one week. To accommodate the possibility of needing to respond to 
feedback from the CSR, I recommend a large project that has not already 
had CSR review budget at least four weeks of CSR review time ahead of a 
planned integration date.

Particularly large or complex projects should factor in additional time.

A JEP should have gone through the first phase of CSR review, getting to 
Provisional state, before being Proposed to Target for a release. Please 
plan accordingly.

Cheers,

-Joe
CSR Lead