Metabase supports slack integration.
Would be nice to have an option to substitute it with Mattermost.
https://docs.mattermost.com/developer/integration-faq.html#what-does-slack-compatible-mean
MatterMost have slack compatible API, that means that we should be able to work with it by just providing an additional inprut with server name.
Hi @NosovK
There’s already a feature request open for it:
https://github.com/metabase/metabase/issues/2231 - upvote by clicking 
on the first post
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