thanos-query-frontend: Enable Thanos Query Stats Propagation & cache response headers #10
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Thanos Query gives us some really nice detailed internal stats - but thanos-query-frontend annoyingly blats them by trying to parse the response as a Prometheus response, which has different fields and a different structure. In addition, thanos-query-frontend doesn't even pass the &stats=all parameter through if you try to request it. This change fixes this by propagating the stats request parameter to the downstream, and decoding/encoding the Thanos Query stats structure properly. As an extra, we also set a response header if we get a cache hit so that upstreams can use this. Signed-off-by: milesbryant <[email protected]>
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Thanos Query gives us some really nice detailed internal stats - but thanos-query-frontend annoyingly blats them by trying to parse the response as a Prometheus response, which has different fields and a different structure.
In addition, thanos-query-frontend doesn't even pass the &stats=all parameter through if you try to request it.
This change fixes this by propagating the stats request parameter to the downstream, and decoding/encoding the Thanos Query stats structure properly.
As an extra, we also set a response header if we get a cache hit so that upstreams can use this.