Rudder

Technique that are not found anymore in the git repository must be disabled.

Moreover, the error message is quite unuseful:

No technique available for that active technique

Great, what technique ? What version ? Is it used in directives ?

And finally, if you go to the technique tree, the active technique without matching technique are just not displayed!

What the user is expected to do ?

A workaround if you know what is the ID of the missing technique is:
- to add-back the technique with a version in /var/rudder/configuration-repository/techniques/.../ + git add & git commit
- to go the Rudder page Administration > Techniques
click on [Update Techniques Now]
- the technique name should appear in place of "No technique available for that active technique"
- now, you can remove it from the active techniques tree: click on it, and in the technique details at the bottom of the page, click on [delete]
- and finally, you can remove again the technique files from git and the file system.