# /sys/version-history

The `/sys/version-history` endpoint is used to retrieve the version history of a Vault.

### Read version history

This endpoint returns the version history of the Vault. The response will contain the following keys:

* `keys`: a list of installed versions in chronological order based on the time installed
* `key_info`: a map indexed by the versions found in the `keys` list containing the following subkeys:
  * `build_date`: the time (in UTC) at which the Vault binary used to run the Vault server was built. **Note: Only tracked from version 1.11.0 or greater**
  * `previous_version`: the version installed prior to this version or `null` if no prior version exists
  * `timestamp_installed`: the time (in UTC) at which the version was installed

| Method | Path                   |
| ------ | ---------------------- |
| `LIST` | `/sys/version-history` |

#### Sample request

```shell-session
$ curl \
    -X LIST --header "X-Vault-Token: ..." \
    http://127.0.0.1:8200/v1/sys/version-history
```

#### Sample response

```json
{
  "keys": ["1.9.0", "1.9.1", "1.9.2", "1.11.0"],
  "key_info": {
    "1.9.0": {
      "build_date": null,
      "previous_version": null,
      "timestamp_installed": "2021-11-18T10:23:16Z"
    },
    "1.9.1": {
      "build_date": null,
      "previous_version": "1.9.0",
      "timestamp_installed": "2021-12-13T11:09:52Z"
    },
    "1.9.2": {
      "build_date": null,
      "previous_version": "1.9.1",
      "timestamp_installed": "2021-12-23T10:56:37Z"
    },
    "1.11.0": {
      "build_date": "2022-05-03T08:34:11Z",
      "previous_version": null,
      "timestamp_installed": "2022-05-03T13:16:04Z"
    }
  }
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.enclaive.cloud/vault/api/system-backend/sys-version-history.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.