Can this feature be flipped via environment variable? Those are already supported in manifests. But if not I'm not opposed to it. Heads up that ownership of harnesses has transferred out of Releng to Marco's team (triage owners need updating), so Geoff and I wouldn't be the ones working on this. Test harnesses have always been neglected and they are doubly so now, so you might need to attempt this yourself if it's urgent.
Bug 1762647 Comment 1 Edit History
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Can this feature be flipped via environment variable? Those are already supported in manifests. But otherwise I'm not opposed to it. Heads up that ownership of harnesses has transferred out of Releng to Marco's team (triage owners need updating), so Geoff and I wouldn't be the ones working on this. Test harnesses have always been neglected and they are doubly so now, so you might need to attempt this yourself if it's urgent.