Retrieve bias metrics from thanos querier (#1472) (#1473)

[alexcreasy]

cherry-pick fix for issue #1472 from f/mserving-metrics to incubation branch.

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[lucferbux]

@alexcreasy why don't you merge f/mserving over the incubation branch?
We are trying to avoid as many cherry-picking as possible, as it's fairly hard to keep track later.

[alexcreasy]

@alexcreasy why don't you merge f/mserving over the incubation branch?
We are trying to avoid as many cherry-picking as possible, as it's fairly hard to keep track later.

@lucferbux Because there's no common base between the two branches, it's very difficult to actually do the merge each time. It tries to merge the entire branch history again.

Neither f/mserving-metrics nor incubation is ever rebased off main (for good reason) it gets merged to both branches. The problem that creates though is that, as main is merged via a merge commit into both branches separately it doesn't give a common base to merge off easily.

If I merge main to both branches now - my commit on mserving-metrics will be behind both branches, making the merge near impossible as far as I'm aware.

I've cherry-picked with the -xs flags which will record the sha of the original commit and user who made the cherry pick in the commit message, which makes it a lot easier to see where it has come from.

Just in case anyone reads this in the future, I'd slightly misunderstood the issue. Closing this PR and will attempt a merge commit after fixing the issues preventing them.