Can't find out who restart or deploy the build

I can’t find a way to trace who restarted or deployed the build. The only name I can trace is the commit author, which is not enough.

I need to find out, after the commit build is triggered, if someone restart the build again, who did it. Same for deployment.

Second, I also need it to be list when I report the build updates to slack. But check the parameters in Slack plugin, no this parameter.

Are there any exist issues or PRs in drone for this feature already?