<Krinkle> CI and tool labs are quite user-facing, should that just be irresponsive with no user-facing message?
Indeed, they shouldn't be. A simple page that says 'hang on tight' would be nice.
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This can be done fairly cleanly at the proxy level (though of course that will not catch the cases when the proxy themselves are down). Ima take a stab at it.
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We already have a 'tool labs is down' hiera-based handler. We can probably just use that for this, assuming it's supposed to block/catch all http traffic?
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This task has 'tool labs' in the title ;-)
As for the rest of labs -- I think the central proxy is also an instance of dynamicproxy, so it might be fairly easy to apply the same change there.