Adding support for feature flags in pages

We're adding host api for gitlab-pages &1316 (closed)

Can we also return the list of feature flags enabled for the relevant project?

That could make rolling out changes for features like Object Storage Support easier

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cc @krasio @darbyfrey @cstasik @nick.thomas @nolith

@vshushlin Do we need this? For object storage we'll have the information needed in the response as source - https://gitlab.com/gitlab-org/gitlab-ce/blob/ba1b3f4573597093c5b6c3f91ea90b5dc2db3ddc/app/models/pages_lookup_path.rb#L23-28 (i.e. source.type will be url).

Good point, I missed that somehow =)

I'd still leave this proposal alive since I often miss having feature flags in pages for rolling out other changes.

Maybe this will be a good opportunity to start using our own feature flags implementation.

Yes, but we need to wait for user-id strategy then.

One next could be to add the Unleash client in to Pages. Work is being done in %12.3 to add it to CE/EE, so there might be a pattern to follow there as well.

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mentioned in issue gitlab-org/quality/triage-reports#811 (closed)

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