[3.5] mvcc: Printing etcd backend database related metrics inside scheduleCompaction function

[rahulbapumore]

Backporting commit 21bbc82 in etcd 3.5
To improve traceability of backend database usage, Added below parameter related to backend database usage metrics inside scheduledCompaction function.
current-db-size-bytes
current-db-size
current-db-size-in-use-bytes
current-db-size-in-use

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

Hi @rahulbapumore. Thanks for your PR.

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[rahulbapumore]

Hi @ahrtr ,
Could you please have a look at this pull request?

Thanks

[ahrtr]

Backporting #17204

[ahrtr]

lgtm

Thanks

[jmhbnz]

LGTM

Given this touches log output we should probably add to 3.5 changelog once merged

[rahulbapumore]

Hi @ahrtr ,
Just a question
What would be the target version for this change and any timeline for it?

Thanks

[ahrtr]

What would be the target version

3.5.12

any timeline for it

Not finalised yet. But I think roughly in 1 ~ 2 months