I use Slack often, and yes I know about the search feature. How do I find the answer to a question that was posted two months ago, for an open source project t

I use Slack often, and yes I know about the search feature. How do I find the answer to a question that was posted two months ago, for an open source project that is not paying to keep more than 10K messages? History vanishes with Slack. I get why this is very cool for internal communication. I just question the use of Slack for open source community driven projects.