You don't, because slack is ephemeral. You join/are joined to a channel because its relevant to what or who you are working _now_. If you want help, then you g

You don't, because slack is ephemeral. You join/are joined to a channel because its relevant to what or who you are working _now_. If you want help, then you go to #department or #thing those are the default public channels. For example I was in a "SRE/devop/sysadmin" role, and I would be embedded in a production/feature team. So I would be part of sre-private and sre. I would also be part of #widget #widget-private and any sub feature teams. This means that noise is neatly compartmentalised. I don't have to sift because its already in a labelled bucket.