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v8.5.6 release notes: add info about cluster_id (#22766) #22793

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v8.5.6 release notes: add info about cluster_id (#22766) #22793

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6 changes: 6 additions & 0 deletions releases/release-8.5.6.md
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Expand Up @@ -120,6 +120,12 @@ For TiDB clusters newly deployed in v8.5.5 (that is, not upgraded from versions
| TiKV | [`resource-metering.enable-network-io-collection`](https://docs.pingcap.com/tidb/v8.5/tikv-configuration-file#enable-network-io-collection-new-in-v856) | Newly added | Controls whether TiKV network traffic and logical I/O metrics are additionally collected in Top SQL. The default value is `false`. |
| TiCDC | [`sink.csv.output-field-header`](https://docs.pingcap.com/tidb/v8.5/ticdc-csv#use-csv) | Newly added | Controls whether a header row is output in CSV files. The default value is `false`. This parameter applies only to the TiCDC new architecture. |

### System table changes

| System table | Change type | Description |
| -------- | -------- | -------- |
| [`mysql.tidb`](https://docs.pingcap.com/tidb/v8.5/mysql-schema#cluster-status-system-tables) | Modified | Adds the `cluster_id` field, which represents the unique identifier of a TiDB cluster. Note that `cluster_id` is read-only and cannot be modified. |
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@gemini-code-assist gemini-code-assist Bot Apr 22, 2026

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low

The description is slightly wordy and contains redundant information. Since "read-only" already implies that the field cannot be modified, the phrase "and cannot be modified" is unnecessary. Additionally, "which represents" can be simplified to "which is" for better clarity and conciseness, following the repository's writing principles to avoid unnecessary words.

Suggested change
| [`mysql.tidb`](https://docs.pingcap.com/tidb/v8.5/mysql-schema#cluster-status-system-tables) | Modified | Adds the `cluster_id` field, which represents the unique identifier of a TiDB cluster. Note that `cluster_id` is read-only and cannot be modified. |
| [`mysql.tidb`](https://docs.pingcap.com/tidb/v8.5/mysql-schema#cluster-status-system-tables) | Modified | Adds the `cluster_id` field, which is the unique identifier of the TiDB cluster. This field is read-only. |
References
  1. Avoid unnecessary words and repetition. (link)
  2. Clarity, simplicity, completeness, and readability. (link)


## Deprecated features

- Starting from v8.5.6, statistics Version 1 (`tidb_analyze_version = 1`) is deprecated and will be removed in a future release. It is recommended that you use statistics Version 2 (`tidb_analyze_version = 2`) and [migrate existing objects that use statistics Version 1 to Version 2](https://docs.pingcap.com/tidb/v8.5/statistics#switch-between-statistics-versions) for more accurate statistics.
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