Method floatHistogramSamplesV2

tsdb/record/record.go:1271–1300

floatHistogramSamplesV2 encodes exponential float histogram samples and splits off custom-bucket float histogram samples to be encoded later.

(histograms []RefFloatHistogramSample, b []byte)

// floatHistogramSamplesV2 encodes exponential float histogram samples and
// splits off custom-bucket float histogram samples to be encoded later.
func (*Encoder) floatHistogramSamplesV2(histograms []RefFloatHistogramSample, b []byte) []byte {
	buf := encoding.Encbuf{B: b}
	buf.PutByte(byte(FloatHistogramSamplesV2))

	if len(histograms) == 0 {
		return buf.Get()
	}

	var first, prev *RefFloatHistogramSample
	for _, fh := range histograms {
		if first == nil {
			first = &fh
			buf.PutVarint64(int64(first.Ref))
			buf.PutVarint64(first.T)
			buf.PutVarint64(first.ST)
			prev = first
			EncodeFloatHistogram(&buf, fh.FH)
			continue
		}

		buf.PutVarint64(int64(fh.Ref) - int64(prev.Ref))
		buf.PutVarint64(fh.T - first.T)

		writeSTMarker(&buf, fh.ST, first.ST, prev.ST)
		EncodeFloatHistogram(&buf, fh.FH)
		prev = &fh
	}

	return buf.Get()
}

// CustomBucketsFloatHistogramSamples appends the encoded custom-bucket float
// histogram samples to b and returns the resulting slice.