CHANGELOG: clarify compaction YAML type

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

CHANGELOG-3.3.md

@@ -133,6 +133,10 @@ See [code changes](https://github.com/coreos/etcd/compare/v3.2.0...v3.3.0) and [
 - Replace [gRPC gateway](https://github.com/grpc-ecosystem/grpc-gateway) endpoint `/v3alpha` with [`/v3beta`](https://github.com/coreos/etcd/pull/8880).
   - To deprecate [`/v3alpha`](https://github.com/coreos/etcd/issues/8125) in v3.4.
   - In v3.3, `curl -L http://localhost:2379/v3alpha/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` still works as a fallback to `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'`, but `curl -L http://localhost:2379/v3alpha/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` won't work in v3.4. Use `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` instead.
+- Change `--auto-compaction-retention` flag to [accept string values](https://github.com/coreos/etcd/pull/8563) with [finer granularity](https://github.com/coreos/etcd/issues/8503).
+  - Now that `--auto-compaction-retention` accepts string values, etcd configuration YAML file `log-output` field must be changed to `string` type.
+  - Previously, `--config-file etcd.config.yaml` can have `auto-compaction-retention: 24` field, now must be `auto-compaction-retention: "24"` or `auto-compaction-retention: "24h"`.
+  - If configured as `--auto-compaction-mode periodic --auto-compaction-retention "24h"`, the time duration value for `--auto-compaction-retention` flag must be valid for [`time.ParseDuration`](https://golang.org/pkg/time/#ParseDuration) function in Go.
 
 ### Dependency
 
@@ -199,6 +203,9 @@ See [security doc](https://github.com/coreos/etcd/blob/master/Documentation/op-g
   - Useful for [bypassing critical APIs when monitoring etcd](https://github.com/coreos/etcd/issues/8060).
 - Add [`--auto-compaction-mode`](https://github.com/coreos/etcd/pull/8123) flag to [support revision-based compaction](https://github.com/coreos/etcd/issues/8098).
 - Change `--auto-compaction-retention` flag to [accept string values](https://github.com/coreos/etcd/pull/8563) with [finer granularity](https://github.com/coreos/etcd/issues/8503).
+  - Now that `--auto-compaction-retention` accepts string values, etcd configuration YAML file `log-output` field must be changed to `string` type.
+  - Previously, `--config-file etcd.config.yaml` can have `auto-compaction-retention: 24` field, now must be `auto-compaction-retention: "24"` or `auto-compaction-retention: "24h"`.
+  - If configured as `--auto-compaction-mode periodic --auto-compaction-retention "24h"`, the time duration value for `--auto-compaction-retention` flag must be valid for [`time.ParseDuration`](https://golang.org/pkg/time/#ParseDuration) function in Go.
   - e.g. `--auto-compaction-mode=revision --auto-compaction-retention=1000` automatically `Compact` on `"latest revision" - 1000` every 5-minute (when latest revision is 30000, compact on revision 29000).
   - e.g. `--auto-compaction-mode=periodic --auto-compaction-retention=72h` automatically `Compact` with 72-hour retention windown, for every 7.2-hour.
   - e.g. `--auto-compaction-mode=periodic --auto-compaction-retention=30m` automatically `Compact` with 30-minute retention windown, for every 3-minute.

CHANGELOG-3.4.md

@@ -75,8 +75,8 @@ See [code changes](https://github.com/coreos/etcd/compare/v3.3.0...v3.4.0) and [
 - Remove [`embed.Config.SetupLogging`](https://github.com/coreos/etcd/pull/9572).
   - Now logger is set up automatically based on [`embed.Config.Logger`, `embed.Config.LogOutput`, `embed.Config.Debug` fields](https://github.com/coreos/etcd/pull/9572).
 - Change [`embed.Config.LogOutput` type from `string` to `[]string`](https://github.com/coreos/etcd/pull/9579) to support multiple log outputs.
-  - Now that `log-output` accepts multiple writers, etcd configuration YAML file `log-output` field must be changed to `[]string` type.
-  - Previously, `etcd.config.yaml` can have `log-output: default` field, now must be `log-output: [default]`.
+  - Now that `--log-output` accepts multiple writers, etcd configuration YAML file `log-output` field must be changed to `[]string` type.
+  - Previously, `--config-file etcd.config.yaml` can have `log-output: default` field, now must be `log-output: [default]`.
 - Remove [`pkg/cors` package](https://github.com/coreos/etcd/pull/9490).
 - Move `"github.com/coreos/etcd/snap"` to [`"github.com/coreos/etcd/raftsnap"`](https://github.com/coreos/etcd/pull/9211).
 - Move `"github.com/coreos/etcd/etcdserver/auth"` to [`"github.com/coreos/etcd/etcdserver/v2auth"`](https://github.com/coreos/etcd/pull/9275).