Seems to be a feature request, marking it as untriaged for further triage.

Over to Pavol, who took over generating policy templates recently. It is very strange that DeveloperToolsDisabled should be missing from ADM/ADMX. It has been around since Chrome 9 (i.e., since 2011).

Julian, do you know why this policy would be missing

I guess the request here goes beyond the scope of disabling the developer tools. We do have the policy DeveloperToolsDisabled (https://www.chromium.org/administrators/policy-list-3#DeveloperToolsDisabled) which controls the general availability of dev.tools and it is present in the ADM[X] templates. 

Can you please describe which settings for dev.tools you wish to control through GPO?

I am actually trying to enforce sub settings in Developer Tools. For the company I work for we are trying to establish Timestamps and Preserving logs. This is what I could not find. I know how to set it manually but 200+ computers to apply it to could be a tad bit tedious :).

For retrieving logs you may try : LogUploadEnabled

https://www.chromium.org/administrators/policy-list-3#LogUploadEnabled

Not seeing any policy specific to for timestamps.

Thanks for the response. I have tried that and it did not seem to have an impact in the way I was hoping which was simply checking the box for Preserving Logs. The only thing I can imagine is the tester is not seeing that behavior on their end after I have the setting set.

This seems to be a request to do the equivalent of the following manual steps:
(1) Open Developer Tools, go to Developer Tools Settings
(2) Check "Console"/"Show timestamps"
(3) Check "Console"/"Preserve log upon navigation"
through enterprise policy.
Currently, we have no policy control over developer tools sub-settings, and I doubt there were plans to introduce such policy control.

Would you mind explaining what your usecase is?