A few months ago, I added an API to retrieve raw performance artifacts (as processed from Talos) for :ekyle to use. It seems to have broken, when I go to e.g. https://treeherder.mozilla.org/api/project/mozilla-central/performance_artifact/ I get: "'JobsModel' object has no attribute 'get_performance_artifact_list'" whereas before it would give a list of performance artifacts. We probably want this at some point to be able to show details of the results that went into a perfherder datapoint (since these artifacts contain the replicates of the results of a specific tests). Both :ekyle and :sguha have also expressed interest in having access to this data to run analytics, etc.
I removed performance artifact support a few months ago. We might bring it back, but this bug is no longer relevant.