The channel #wikimedia-codereview was created as part of T128371: Set up Code Review office hours. The creation was opposed on that task almost immediately after it was done. Excerpts from various comments and arguments can be found below (tried to adress both sides with everything I could find, despite my bias). Personally I've already expressed that I'm in favor of dropping that channel and move things over to #wikimedia-tech. As I found a lot of other comments that seem to agree (or that at least stated this channel should not have been created in the first place) I've got the impression one could even say there is consensus not to have a seperate channel for this, hence I'm creating this task.
This has come up again in T173770: Code Review Hours advertised but not taking place? lately:
Luke081515 created that channel, though I haven't seen a comment from him about this.
So, the arguments are basically:
Keep #wikimedia-codereview, stuff won't get lost in unrelated discussion there, which is likely to happen in other channels.
Drop it, move code review (sessions) elsewhere (i.e. in #mediawiki or #wikimedia-tech), where more (hopefully most?) people will notice it and are more likely to do 'drive-by' reviews. Also, let's not have Yet Another Channel™. With the "Technical Advice IRC meeting" there are other events somewhat aiming for newcomers in #wikimedia-tech already too, so having it there might help concentrating things in one place.
To counter the "stuff get's lost there" argument: Both of these channels do not have bots (wikibugs, monitoring or similar) sending messages to it (humans only). Especially #wikimedia-tech is rather low-traffic (having a quick look at the txt log files with wc -l exposes it were about 54 messages/day for September - on average, that is - but granted, 4 days peaked to >100).