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Support high-dpi graph image generation
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Description

For high-resolution devices, generate high resolution images instead of low res.

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Where would this high resolution image be used at? Is there a specific use case you have in mind?

Any browser running on a high-dpi device, e.g. most new mobile phones.

Text look really blurry and ugly on high-dpi devices now.

@Elitre - I believe what you're seeing is what this task was meant to fix, but not a bug per se.

Vega added the ability to scale up the resolution of PNG output in v3.0.9, so it seems like this task may depend on adding support for Vega 3 (T165118).

With the Graphiod service undeployed (T242855), is this task still valid?

Jdforrester-WMF subscribed.

The Graphoid service has been undeployed and the repo is being archived, per T274738: Archive the graphoid service and deploy repos.