Plan to release v3.5.20

[ivanvc]

What would you like to be added?

The etcd patch release criteria has been met for our release-3.5
stable branch, so we should release v3.5.20.

Work in progress CHANGELOG is: https://github.com/etcd-io/etcd/blob/main/CHANGELOG/CHANGELOG-3.5.md#v3520-tbc

The list of commits included since the previous release is: v3.5.19...release-3.5:

• [release-3.5] deflakey: TestCompactionHash in integration #19542
• [release-3.5] back port gofail comments #19525
• [release-3.5] fix: grpcproxy can get stuck in and endless loop causing high cpu usage #19562
• [release-3.5] test: Update server unit test cases to set a backend #19573
• [release-3.5] Fix the learner promotion changes not being persisted into v3store (bbolt) #19563
• [release-3.5] use RLock in Demoted method for read-only access to expiry #19445
• [release-3.5] Fix the issue that learner promotion command doesn't support json output #19602
• [release-3.5] Add e2e test to verify etcd is able to automatically fix the issue #19629

Outstanding tasks before releasing this version:

• [release-3.5] Learner promotion isn't persisted to v3store (bbolt) #19557 / [release-3.5] [Solution 2] Auto sync members in v3store if Islearner is the only field that differs between v2store and v3store #19606

Release team

GitHub handle	Role
@ivanvc	Release lead
@ahrtr	Release advisor

Why is this needed?

Regular patch releases are vital to ensure our users have bug-free and secure software.

[ahrtr]

@ivanvc just merged #19629, we are ready to release 3.5.20.

[ivanvc]

@jmhbnz are you free tomorrow at 11 am PT or the following Monday? If you're not available, @ahrtr, would you be able to be the release advisor?

[ivanvc]

We're expediting this release as has the fix for #19557. @ahrtr and me will do the release at 12 pm PT.

[ahrtr]

Thanks @ivanvc for the quick response on the release!

[ivanvc]

Closing with the release complete.