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An error occurred while saving the commentMike commented
We currently use this in mattermost for integration with our ticketing system. For example, a mention of #ticket_number pulls metadata from our request tracker.
Its also a requirement if you want to bridge channels with external services. For example, we use matterbridge to connect a private channel to a partner's slack instance in order to have cross-site communication w/o creating accounts in both systems for every single person.