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That is nice. We can probably add it to mediawiki/tools/releng.git which ends up being published to https://doc.wikimedia.org/mw-tools-releng/devdeployflow/index.html
That uses https://pypi.python.org/pypi/seqdiag/
example: http://blockdiag.com/en/seqdiag/index.html
We did with greg ages ago