CHANGELOG-3.6.md

Previous change logs can be found at CHANGELOG-3.5.

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v3.6.0 (TBD)

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v3.6.0-rc.3 (TBD)

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v3.6.0-rc.2 (2025-03-05)

etcd server

• Add Prometheus metric to query server feature gates.

Dependencies

• Compile binaries using go 1.23.7.
• Bump golang.org/x/net to v0.36.0 to address CVE-2025-22870.
• Bump github.com/grpc-ecosystem/grpc-gateway/v2 to v2.26.3 to fix the issue of etcdserver crashing on receiving REST watch stream requests.

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v3.6.0-rc.1 (2025-02-25)

etcdctl v3

• Add DowngradeInfo in result of endpoint status

etcd server

• Add DowngradeInfo to endpoint status response

Dependencies

• Bump golang.org/x/crypto to v0.35.0 to address CVE-2025-22869.

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v3.6.0-rc.0 (2025-02-13)

See code changes.

Breaking Changes

• etcd will no longer start on data dir created by newer versions (for example etcd v3.6 will not run on v3.7+ data dir). To downgrade data dir please check out etcdutl migrate command.
• etcd doesn't support serving client requests on the peer listen endpoints (--listen-peer-urls). See pull/13565.
• etcdctl will sleep(2s) in case of range delete without --range flag. See pull/13747
• Applications which depend on etcd v3.6 packages must be built with go version >= v1.18.

Deprecations

• Deprecated V2 discovery.
• Deprecated SetKeepAlive and SetKeepAlivePeriod in limitListenerConn.
• Removed etcdctl defrag --data-dir.
• Removed etcdctl snapshot status.
• Removed etcdctl snapshot restore.
• Removed etcdutl snapshot save.
• Removed NewZapCoreLoggerBuilder in server/embed

etcdctl v3

• Add command to generate shell completion.
• When print endpoint status, show db size in use
• Always print the raft_term in decimal when displaying member list in json.
• Add one more field storageVersion into the response of command etcdctl endpoint status.
• Add --max-txn-ops flag to make-mirror command.
• Add --consistency flag to member list command.
• Display field hash_revision for etcdctl endpoint hash command.
• Add --max-request-bytes and --max-recv-bytes global flags.

etcdutl v3

• Add command to generate shell completion.
• Add migrate command for downgrading/upgrading etcd data dir files.
• Add optional --bump-revision and --mark-compacted flag to etcdutl snapshot restore operation.
• Add hashkv command to print hash of keys and values up to given revision
• Removed legacy etcdutl backup
• Count the number of keys from users perspective

Package clientv3

• Support serializable MemberList operation.

Package server

• Package mvcc was moved to storage/mvcc
• Package mvcc/backend was moved to storage/backend
• Package mvcc/buckets was moved to storage/schema
• Package wal was moved to storage/wal
• Package datadir was moved to storage/datadir

Package raft

• Decouple raft from etcd. Migrated raft to a separate repository, and renamed raft module to go.etcd.io/raft/v3.

etcd server

• Add etcd --log-format flag to support log format.
• Add etcd --experimental-max-learners flag to allow configuration of learner max membership.
• Add etcd --experimental-enable-lease-checkpoint-persist flag to handle upgrade from v3.5.2 clusters with this feature enabled.
• Add etcdctl make-mirror --rev flag to support incremental mirror.
• Add v3 discovery to bootstrap a new etcd cluster.
• Add field storage into the response body of endpoint /version.
• Add etcd --max-concurrent-streams flag to configure the max concurrent streams each client can open at a time, and defaults to math.MaxUint32.
• Add etcd grpc-proxy --experimental-enable-grpc-logging flag to logging all grpc requests and responses.
• Add etcd --experimental-compact-hash-check-enabled --experimental-compact-hash-check-time flags to support enabling reliable corruption detection on compacted revisions.
• Add Protection on maintenance request when auth is enabled.
• Graduated --experimental-warning-unary-request-duration to --warning-unary-request-duration. Note the experimental flag is deprecated and will be decommissioned in v3.7.
• Add field hash_revision into HashKVResponse.
• Add etcd --experimental-snapshot-catch-up-entries flag to configure number of entries for a slow follower to catch up after compacting the raft storage entries and defaults to 5k.
• Decreased --snapshot-count default value from 100,000 to 10,000
• Add etcd --tls-min-version --tls-max-version to enable support for TLS 1.3.
• Add quota to endpoint status response
• Add feature gate SetMemberLocalAddr to enable using the first specified and non-loopback local address from initial-advertise-peer-urls as the local address when communicating with a peer
• Add Support multiple values for allowed client and peer TLS identities
• Add embed.Config.GRPCAdditionalServerOptions to support updating the default internal gRPC configuration for embedded use cases.

etcd grpc-proxy

• Add etcd grpc-proxy start --endpoints-auto-sync-interval flag to enable and configure interval of auto sync of endpoints with server.
• Add etcd grpc-proxy start --listen-cipher-suites flag to support adding configurable cipher list.
• Add tls min/max version to grpc proxy to support setting TLS min and max version.

tools/benchmark

• Add etcd client autoSync flag

Metrics, Monitoring

See List of metrics for all metrics per release.

• Add etcd_disk_defrag_inflight.
• Add etcd_debugging_server_alarms.
• Add etcd_server_range_duration_seconds.

Go

• Require Go 1.23+.
• Compile with Go 1.23+. Please refer to gc-guide to configure GOGC and GOMEMLIMIT properly.

Other

• Use Distroless as base image to make the image less vulnerable and reduce image size.
• Upgrade grpc-gateway from v1 to v2.
• Switch from grpc-ecosystem/go-grpc-prometheus to grpc-ecosystem/go-grpc-middleware/providers/prometheus.

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