Diagrams and flowcharts support (Markdown)
Mermaid (Introduced in GitLab 10.3)
It is possible to generate diagrams and flowcharts from text using Mermaid.
In order to generate a diagram or flowchart, you should write your text inside the mermaid block.
More info on:
- Gitlab Mermaid: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/user/markdown.md#mermaid
- Mermaid official page's: https://mermaidjs.github.io/
- Mermaid Github with examples: https://github.com/knsv/mermaid

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Timo Friedl commented
It would be very great if Mattermost would support mermaid just like it supports other markdown. Gitlab here is only mentioned as it also supports it.
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Simon Gardner commented
I also think this would be a very useful feature. and it isn't a feature proposal for gitlab.
If Mattermost supported the Markdown Mermaid syntax it would be possible to share and collaborate on (node) graphs directly in messages.
It would be a very powerful feature. I was sad when I discovered this page and realised MM didn't support mermaid :(
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Fabianski_tr commented
Gitlab already supports this feature the problem is that if you consult information that uses Mermaid in a readme.md of a project in Gitlab, Mattermost is not able to show that flowchart because it does not support it.
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Thanks Fabianski_tr! Is this a feature proposal for GitLab?
If so, you can open a feature proposal at https://gitlab.com/gitlab-org/gitlab-ce/issues/new using the "Feature Proposals" template.