Ideally, I’m hoping to find a way to tag or mark a post as “response needed” or similar, and that would trigger an autobump every x hours until there’s a response.
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Actually I found this with the help of the “related topics” from this post and it looks like the feature doesn’t do something like this.
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Welcome at Meta 
Did you take a look at the automation plugin?
That has a trigger for topics not receiving a reply
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