# Value History

With CloudTruth you can view historical changes to configuration parameter values for your [projects ](https://docs.cloudtruth.com/configuration-management/projects)and [environments](https://docs.cloudtruth.com/configuration-management/environments). This allows you to audit and rollback configuration changes that may not have been effective or caused unintended behaviors in your application.

## Retrieving previous parameter value versions

You can access the history page from your selected project by clicking `History`. The history screen displays the selected environment and the current parameter values for that environment.

![](https://2952342643-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MGjN2Xg1mE8iTvg49dw%2Fuploads%2Fgit-blob-0f51b127a283174f000ac7c9f986fbdbc2305949%2Fimage%20\(215\).png?alt=media)

### History by Tag

You can select an [environment tag](https://docs.cloudtruth.com/environments#tagging) to compare the current projects parameters to and click Apply.

![](https://2952342643-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MGjN2Xg1mE8iTvg49dw%2Fuploads%2Fgit-blob-7f6acee5a07a65375f20dccbe54cc2b832045dc4%2Fimage%20\(216\).png?alt=media)

The table now displays values for your project parameters for the current time compared to the parameter values at the selected tag.

![](https://2952342643-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MGjN2Xg1mE8iTvg49dw%2Fuploads%2Fgit-blob-0c1e8ac9080a791be2faf9149b56b9f67cc151df%2Fimage%20\(217\).png?alt=media)

You can rollback current values directly from the history page with the edit operation![](https://2952342643-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MGjN2Xg1mE8iTvg49dw%2Fuploads%2Fgit-blob-62e6772cbd9df2e2107e414b77b946166c995f28%2Fthumbnail%20\(3\).jpg?alt=media)for each individual value.

### History by date

You can now select a date and approximate time to compare the current projects parameters to\*\*.\*\*

![](https://2952342643-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MGjN2Xg1mE8iTvg49dw%2Fuploads%2Fgit-blob-1f002c38d8650e1aed2d5afbed6ac53c41356a7e%2Fimage%20\(218\).png?alt=media)

The table now displays values for your project parameters for the current time compared to the parameter values at a previous point in time.

If you discover a value that is not quite right, you can modify current values directly from the history page with the edit operation![](https://2952342643-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MGjN2Xg1mE8iTvg49dw%2Fuploads%2Fgit-blob-62e6772cbd9df2e2107e414b77b946166c995f28%2Fthumbnail%20\(3\).jpg?alt=media)for each individual value.

![](https://2952342643-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MGjN2Xg1mE8iTvg49dw%2Fuploads%2Fgit-blob-66ad0f854e4bd5d0cfe969a1c15c497696a8823a%2Fimage%20\(219\).png?alt=media)

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