Native histograms (also known as sparse histograms) are an experimental Prometheus feature.
They use protobuf as the reporting layer.
Native histograms hold the benefits of high resolution at a lower resource cost.
This series allows sending histograms in a native histogram format over protobuf.
By default, protobuf support is disabled. To use protobuf with native histograms, the command line flag prometheus_allow_protobuf should be set to true, and the Prometheus server should send the accept header with protobuf.
Fixes#12931Closesscylladb/scylladb#16737
* github.com:scylladb/scylladb:
main.cc: Add prometheus_allow_protobuf command line
histogram_metrics_helper: support native histogram
config: Add prometheus_allow_protobuf flag
df6c9828ef