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Ref: https://github.com/prometheus/prometheus/issues/15021 Also modified spansToSpansProto to not allocate empty bucket spans array when converting internal model to remote write model. Otherwise the test TestDecodeWriteV2Request fails since empty array is marshaled/unmarshaled as nil so we don't get back the exact same thing. Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>
The compiled protobufs are version controlled and you won't normally need to re-compile them when building Prometheus.
If however you have modified the defs and do need to re-compile, run
make proto from the parent dir.
In order for the script to run, you'll need protoc (version 3.15.8) in
your PATH.