UPSTREAM: <carry>: storage/backend: Add a gauge to indicate if defrag is active

[hexfusion]

cherry-pick of etcd-io#13371

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

[openshift-ci]

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In response to this:

UPSTREAM: : storage/backend: Add a gauge to indicate if defrag is active

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[hexfusion]

cc @lilic @hasbro17

[hexfusion]

manually adding valid bug as it is not required in 4.10 during dev cycle.

[hasbro17]

/lgtm

I'm guessing this should make it easier to check whether defrag controller is active during latency spikes (and thus make our hand wringing more efficient).

[hexfusion]

/lgtm

I'm guessing this should make it easier to check whether defrag controller is active during latency spikes (and thus make our hand wringing more efficient).

Right is the members store still being actively defragmented.

[lilic]

/lgtm
/approve

[openshift-ci]

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This pull-request has been approved by: hasbro17, hexfusion, lilic

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