Questions
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Should I set blog category/tag pages as "noindex"? If so, how do I prevent "meta noindex" Moz crawl errors for those pages?
In the situation outline by the OP, these pages are noindexed. There’s no value to clutterig up crawl reports on these pages. Block rogerbot from non-critical parts of your site, unless you want to be alerted of issues, then don’t.
Moz Tools | | LoganRay0