Previous change logs can be found at [CHANGELOG-3.6](https://github.com/etcd-io/etcd/blob/main/CHANGELOG/CHANGELOG-3.6.md).

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## v3.7.0 (TBD)

### Breaking Changes

- [Removed all deprecated experimental flags](https://github.com/etcd-io/etcd/pull/19959)
- [Removed v2discovery](https://github.com/etcd-io/etcd/pull/20109)
- [Removed client/v2](https://github.com/etcd-io/etcd/pull/20117)
- [Removed v2 request and apply_v2.go](https://github.com/etcd-io/etcd/pull/21263)

### etcd server

- [Prioritize LeaseRevoke requests to ensure timely lease expiration during overload conditions](https://github.com/etcd-io/etcd/pull/20492)
- [Update go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc to v0.61.0 and replaced the deprecated `UnaryServerInterceptor` and `StreamServerInterceptor` with `NewServerHandler`](https://github.com/etcd-io/etcd/pull/20017)
- [Add Support for Unix Socket endpoints](https://github.com/etcd-io/etcd/pull/19760)
- [Improves performance of lease and user/role operations (up to 2x) by updating `(*readView) Rev()` to use `SharedBufReadTxMode`](https://github.com/etcd-io/etcd/pull/20411)
- [Allow client to retrieve AuthStatus without authentication](https://github.com/etcd-io/etcd/pull/20802)
- [Add FastLeaseKeepAlive feature to enable faster lease renewal by skipping the wait for the applied index](https://github.com/etcd-io/etcd/pull/20589)
- [Bootstrap etcd from v3store](https://github.com/etcd-io/etcd/issues/20187), see changes below,
  - [Stop loading v2 snapshot files](https://github.com/etcd-io/etcd/pull/21107)
  - [Initialize confState from v3 store on bootstrap](https://github.com/etcd-io/etcd/pull/21138)
  - [Remove flag `--max-snapshots` in 3.8 rather than 3.7](https://github.com/etcd-io/etcd/pull/21160)
  - [Keep the `--snapshot-count` flag](https://github.com/etcd-io/etcd/pull/21162)

### Package `clientv3`

- Allow setting JWT directly by users, see https://github.com/etcd-io/etcd/pull/16803 and https://github.com/etcd-io/etcd/pull/20747.
- [Function etcdClientDebugLevel is renamed to ClientLogLevel and made it public](https://github.com/etcd-io/etcd/pull/20006)

### Package `pkg`

- [Optimize find performance by splitting intervals with the same left endpoint by their right endpoints](https://github.com/etcd-io/etcd/pull/19768)
- [netutil: Refactor IPv6 address comparison logic](https://github.com/etcd-io/etcd/pull/20365)

### Dependencies

- Compile binaries with [Go 1.26](https://go.dev/doc/devel/release#go1.26.minor).
- [Migrate the deprecated go-grpc-middleware v1 logging and tags libraries to v2 interceptors](https://github.com/etcd-io/etcd/pull/20420)

### Deprecations

- Deprecated [UsageFunc in pkg/cobrautl](https://github.com/etcd-io/etcd/pull/18356).

### etcdctl

- [Organize etcdctl commands](https://github.com/etcd-io/etcd/pull/20162) to make them more concise and easier to understand.
- [Hide the global flags](https://github.com/etcd-io/etcd/pull/20493) to make the output of `etcdctl --help` looks cleaner and is consistent with kubectl.

### etcdutl

- [Add a timeout flag to all etcdutl commands](https://github.com/etcd-io/etcd/pull/20708) when waiting to acquire a file lock on the database file.

### Metrics, Monitoring

See [List of metrics](https://etcd.io/docs/latest/metrics/) for all metrics per release.

- Add [`etcd_server_request_duration_seconds`](https://github.com/etcd-io/etcd/pull/21038).
- Add [the following metrics related to watch send loop](https://github.com/etcd-io/etcd/pull/21030),
  - etcd_debugging_server_watch_send_loop_watch_stream_duration_seconds
  - etcd_debugging_server_watch_send_loop_watch_stream_duration_per_event_seconds
  - etcd_debugging_server_watch_send_loop_control_stream_duration_seconds
  - etcd_debugging_server_watch_send_loop_progress_duration_seconds