NHCB is native histograms with custom buckets.
prompb is used for both remote write 1.0 and remote read. We do not
support NHCB over remote write 1.0 , however we should absolutely
support it for remote read.
Prometheus remote write 1.0 client already refuses to send NHCB.
Prometheus remote write 1.0 server accepts NHCB, but doesn't store
custom values, corrupting the result. I'm now handling NHCB correctly,
instead of refusing or corrupting.
Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>
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