Improve channel notification warning
Right now, there's a default ping warning for @channel mentions, which is great (https://mattermost.uservoice.com/forums/306457-general/suggestions/18607111-confirm-with-ping-warning-before-sending-all-eve). However, some channels use @channel a lot and want to disable the warning, but this leads to new users not learning how impactful @channel is.
I propose to expand the setting (https://docs.mattermost.com/administration/config-settings.html#show-channel-and-all-confirmation-dialog), so it includes options to show the warning "first time each day" and/or "once" per user. This allows a nice middle ground between educating users and getting in the way.
Andreas Scharf commented
Good idea! I would also like to have a warning configurable for all posts in Town Square. (You might find this proposal usfull as well: https://mattermost.uservoice.com/forums/306457-general/suggestions/33917131-warning-message-for-all-posts-in-town-square)