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Optionally translate OTEL histograms to NHCB

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Signed-off-by: Carrie Edwards <edwrdscarrie@gmail.com>
This commit is contained in:
Carrie Edwards 2025-01-21 07:33:32 -08:00
parent 39d7242cfe
commit 5489b67f7a
6 changed files with 355 additions and 104 deletions
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1
config/config.go
View file

@ -1442,6 +1442,7 @@ type OTLPConfig struct {
PromoteResourceAttributes []string `yaml:"promote_resource_attributes,omitempty"` PromoteResourceAttributes []string `yaml:"promote_resource_attributes,omitempty"`
TranslationStrategy translationStrategyOption `yaml:"translation_strategy,omitempty"` TranslationStrategy translationStrategyOption `yaml:"translation_strategy,omitempty"`
KeepIdentifyingResourceAttributes bool `yaml:"keep_identifying_resource_attributes,omitempty"` KeepIdentifyingResourceAttributes bool `yaml:"keep_identifying_resource_attributes,omitempty"`
ConvertHistogramsToNHCB bool `yaml:"convert_histograms_to_nhcb,omitempty"`
} }
// UnmarshalYAML implements the yaml.Unmarshaler interface. // UnmarshalYAML implements the yaml.Unmarshaler interface.

278
prompb/types.pb.go
View file

@ -402,10 +402,11 @@ type Histogram struct {
ResetHint Histogram_ResetHint `protobuf:"varint,14,opt,name=reset_hint,json=resetHint,proto3,enum=prometheus.Histogram_ResetHint" json:"reset_hint,omitempty"` ResetHint Histogram_ResetHint `protobuf:"varint,14,opt,name=reset_hint,json=resetHint,proto3,enum=prometheus.Histogram_ResetHint" json:"reset_hint,omitempty"`
// timestamp is in ms format, see model/timestamp/timestamp.go for // timestamp is in ms format, see model/timestamp/timestamp.go for
// conversion from time.Time to Prometheus timestamp. // conversion from time.Time to Prometheus timestamp.
Timestamp int64 `protobuf:"varint,15,opt,name=timestamp,proto3" json:"timestamp,omitempty"` Timestamp int64 `protobuf:"varint,15,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"` CustomValues []float64 `protobuf:"fixed64,16,rep,packed,name=custom_values,json=customValues,proto3" json:"custom_values,omitempty"`
XXX_unrecognized []byte `json:"-"` XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_sizecache int32 `json:"-"` XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
} }
func (m *Histogram) Reset() { *m = Histogram{} } func (m *Histogram) Reset() { *m = Histogram{} }
@ -588,6 +589,13 @@ func (m *Histogram) GetTimestamp() int64 {
return 0 return 0
} }
func (m *Histogram) GetCustomValues() []float64 {
if m != nil {
return m.CustomValues
}
return nil
}
// XXX_OneofWrappers is for the internal use of the proto package. // XXX_OneofWrappers is for the internal use of the proto package.
func (*Histogram) XXX_OneofWrappers() []interface{} { func (*Histogram) XXX_OneofWrappers() []interface{} {
return []interface{}{ return []interface{}{
@ -1146,76 +1154,77 @@ func init() {
func init() { proto.RegisterFile("types.proto", fileDescriptor_d938547f84707355) } func init() { proto.RegisterFile("types.proto", fileDescriptor_d938547f84707355) }
var fileDescriptor_d938547f84707355 = []byte{ var fileDescriptor_d938547f84707355 = []byte{
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0x05, 0xed, 0x9e, 0x20, 0xf7, 0xc1, 0xe4, 0xc1, 0x74, 0x8c, 0x97, 0xa2, 0x1c, 0x65, 0x1e, 0x4c, 0xd9, 0x13, 0xaa, 0xf4, 0xd5, 0x32, 0x98, 0x64, 0xa5, 0xd5, 0x9a, 0xbc, 0x07, 0x55, 0x21, 0x59,
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0x05, 0x33, 0xae, 0x36, 0xa9, 0x24, 0xbb, 0xa3, 0xdd, 0x13, 0xee, 0xef, 0x1a, 0x94, 0x8f, 0xe7, 0x73, 0xca, 0x2d, 0xa3, 0x6d, 0xd1, 0xb5, 0x4d, 0x9a, 0xa0, 0x5f, 0xae, 0x70, 0xfa, 0x55, 0xa9,
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0x55, 0xc3, 0x3d, 0x81, 0x7e, 0x76, 0xb3, 0xf6, 0xa7, 0x6f, 0x8d, 0xcf, 0x6e, 0x52, 0x7f, 0x27, 0x6f, 0x1a, 0x94, 0x8f, 0xe6, 0xcb, 0xe0, 0x25, 0xd9, 0x85, 0x9a, 0xef, 0x05, 0x63, 0x75, 0xdf,
0xbd, 0x04, 0x03, 0x2f, 0x61, 0xb7, 0x78, 0x09, 0x98, 0xa0, 0xd3, 0x0d, 0x26, 0xe1, 0xd4, 0x0b, 0x72, 0xcd, 0x96, 0xef, 0x05, 0xaa, 0x87, 0x7b, 0x02, 0xfd, 0xec, 0x7a, 0xed, 0x4f, 0x1f, 0x24,
0x66, 0xf9, 0x0d, 0xa8, 0x37, 0x1c, 0xbf, 0xaa, 0x4e, 0x71, 0xed, 0x3e, 0x87, 0x6a, 0xc6, 0xba, 0x9f, 0x5d, 0xa7, 0xfe, 0x4e, 0x7a, 0x08, 0x06, 0x1e, 0xc2, 0xfd, 0xe2, 0x21, 0x60, 0x81, 0x4e,
0xd3, 0xbc, 0xdf, 0x0d, 0xd4, 0x13, 0xbb, 0xf1, 0xae, 0xea, 0xe4, 0x7f, 0x70, 0xef, 0xe4, 0x62, 0x37, 0x98, 0x84, 0x53, 0x2f, 0x98, 0xe5, 0x27, 0xa0, 0x1e, 0x7a, 0xfc, 0xaa, 0x3a, 0xc5, 0xb5,
0x70, 0x38, 0x1a, 0x17, 0x1e, 0x5b, 0xf7, 0x07, 0x68, 0x60, 0x46, 0x3e, 0xfd, 0xaf, 0xad, 0xb7, 0xfb, 0x0c, 0xaa, 0x19, 0xeb, 0xd6, 0xe5, 0xfd, 0x6e, 0xa0, 0xde, 0xe1, 0x8d, 0xc7, 0x57, 0x27,
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0x9b, 0xdb, 0x3d, 0xed, 0xb7, 0xdb, 0x3d, 0xed, 0xcf, 0xdb, 0x3d, 0xed, 0x7b, 0x53, 0xb1, 0xa3, 0xf2, 0xe9, 0x7f, 0xbd, 0x7a, 0x7b, 0x60, 0x4e, 0x54, 0x86, 0xec, 0xe6, 0x6d, 0xdf, 0xfa, 0x9a,
0xab, 0x2b, 0x13, 0x7f, 0x71, 0x3e, 0xff, 0x3b, 0x00, 0x00, 0xff, 0xff, 0xfb, 0x5f, 0xf2, 0x4d, 0x2c, 0x20, 0xa1, 0x1d, 0xee, 0xbc, 0xbe, 0xd9, 0xd5, 0x7e, 0xbd, 0xd9, 0xd5, 0xfe, 0xb8, 0xd9,
0x13, 0x09, 0x00, 0x00, 0xd5, 0xbe, 0x37, 0x15, 0x3b, 0xba, 0xbc, 0x34, 0xf1, 0x3f, 0xe8, 0xb3, 0xbf, 0x03, 0x00, 0x00,
0xff, 0xff, 0x8b, 0x63, 0xd6, 0x2e, 0x38, 0x09, 0x00, 0x00,
} }
func (m *MetricMetadata) Marshal() (dAtA []byte, err error) { func (m *MetricMetadata) Marshal() (dAtA []byte, err error) {
@ -1385,6 +1394,18 @@ func (m *Histogram) MarshalToSizedBuffer(dAtA []byte) (int, error) {
i -= len(m.XXX_unrecognized) i -= len(m.XXX_unrecognized)
copy(dAtA[i:], m.XXX_unrecognized) copy(dAtA[i:], m.XXX_unrecognized)
} }
if len(m.CustomValues) > 0 {
for iNdEx := len(m.CustomValues) - 1; iNdEx >= 0; iNdEx-- {
f1 := math.Float64bits(float64(m.CustomValues[iNdEx]))
i -= 8
encoding_binary.LittleEndian.PutUint64(dAtA[i:], uint64(f1))
}
i = encodeVarintTypes(dAtA, i, uint64(len(m.CustomValues)*8))
i--
dAtA[i] = 0x1
i--
dAtA[i] = 0x82
}
if m.Timestamp != 0 { if m.Timestamp != 0 {
i = encodeVarintTypes(dAtA, i, uint64(m.Timestamp)) i = encodeVarintTypes(dAtA, i, uint64(m.Timestamp))
i-- i--
@ -1397,30 +1418,30 @@ func (m *Histogram) MarshalToSizedBuffer(dAtA []byte) (int, error) {
} }
if len(m.PositiveCounts) > 0 { if len(m.PositiveCounts) > 0 {
for iNdEx := len(m.PositiveCounts) - 1; iNdEx >= 0; iNdEx-- { for iNdEx := len(m.PositiveCounts) - 1; iNdEx >= 0; iNdEx-- {
f1 := math.Float64bits(float64(m.PositiveCounts[iNdEx])) f2 := math.Float64bits(float64(m.PositiveCounts[iNdEx]))
i -= 8 i -= 8
encoding_binary.LittleEndian.PutUint64(dAtA[i:], uint64(f1)) encoding_binary.LittleEndian.PutUint64(dAtA[i:], uint64(f2))
} }
i = encodeVarintTypes(dAtA, i, uint64(len(m.PositiveCounts)*8)) i = encodeVarintTypes(dAtA, i, uint64(len(m.PositiveCounts)*8))
i-- i--
dAtA[i] = 0x6a dAtA[i] = 0x6a
} }
if len(m.PositiveDeltas) > 0 { if len(m.PositiveDeltas) > 0 {
var j2 int var j3 int
dAtA4 := make([]byte, len(m.PositiveDeltas)*10) dAtA5 := make([]byte, len(m.PositiveDeltas)*10)
for _, num := range m.PositiveDeltas { for _, num := range m.PositiveDeltas {
x3 := (uint64(num) << 1) ^ uint64((num >> 63)) x4 := (uint64(num) << 1) ^ uint64((num >> 63))
for x3 >= 1<<7 { for x4 >= 1<<7 {
dAtA4[j2] = uint8(uint64(x3)&0x7f | 0x80) dAtA5[j3] = uint8(uint64(x4)&0x7f | 0x80)
j2++ j3++
x3 >>= 7 x4 >>= 7
} }
dAtA4[j2] = uint8(x3) dAtA5[j3] = uint8(x4)
j2++ j3++
} }
i -= j2 i -= j3
copy(dAtA[i:], dAtA4[:j2]) copy(dAtA[i:], dAtA5[:j3])
i = encodeVarintTypes(dAtA, i, uint64(j2)) i = encodeVarintTypes(dAtA, i, uint64(j3))
i-- i--
dAtA[i] = 0x62 dAtA[i] = 0x62
} }
@ -1440,30 +1461,30 @@ func (m *Histogram) MarshalToSizedBuffer(dAtA []byte) (int, error) {
} }
if len(m.NegativeCounts) > 0 { if len(m.NegativeCounts) > 0 {
for iNdEx := len(m.NegativeCounts) - 1; iNdEx >= 0; iNdEx-- { for iNdEx := len(m.NegativeCounts) - 1; iNdEx >= 0; iNdEx-- {
f5 := math.Float64bits(float64(m.NegativeCounts[iNdEx])) f6 := math.Float64bits(float64(m.NegativeCounts[iNdEx]))
i -= 8 i -= 8
encoding_binary.LittleEndian.PutUint64(dAtA[i:], uint64(f5)) encoding_binary.LittleEndian.PutUint64(dAtA[i:], uint64(f6))
} }
i = encodeVarintTypes(dAtA, i, uint64(len(m.NegativeCounts)*8)) i = encodeVarintTypes(dAtA, i, uint64(len(m.NegativeCounts)*8))
i-- i--
dAtA[i] = 0x52 dAtA[i] = 0x52
} }
if len(m.NegativeDeltas) > 0 { if len(m.NegativeDeltas) > 0 {
var j6 int var j7 int
dAtA8 := make([]byte, len(m.NegativeDeltas)*10) dAtA9 := make([]byte, len(m.NegativeDeltas)*10)
for _, num := range m.NegativeDeltas { for _, num := range m.NegativeDeltas {
x7 := (uint64(num) << 1) ^ uint64((num >> 63)) x8 := (uint64(num) << 1) ^ uint64((num >> 63))
for x7 >= 1<<7 { for x8 >= 1<<7 {
dAtA8[j6] = uint8(uint64(x7)&0x7f | 0x80) dAtA9[j7] = uint8(uint64(x8)&0x7f | 0x80)
j6++ j7++
x7 >>= 7 x8 >>= 7
} }
dAtA8[j6] = uint8(x7) dAtA9[j7] = uint8(x8)
j6++ j7++
} }
i -= j6 i -= j7
copy(dAtA[i:], dAtA8[:j6]) copy(dAtA[i:], dAtA9[:j7])
i = encodeVarintTypes(dAtA, i, uint64(j6)) i = encodeVarintTypes(dAtA, i, uint64(j7))
i-- i--
dAtA[i] = 0x4a dAtA[i] = 0x4a
} }
@ -2133,6 +2154,9 @@ func (m *Histogram) Size() (n int) {
if m.Timestamp != 0 { if m.Timestamp != 0 {
n += 1 + sovTypes(uint64(m.Timestamp)) n += 1 + sovTypes(uint64(m.Timestamp))
} }
if len(m.CustomValues) > 0 {
n += 2 + sovTypes(uint64(len(m.CustomValues)*8)) + len(m.CustomValues)*8
}
if m.XXX_unrecognized != nil { if m.XXX_unrecognized != nil {
n += len(m.XXX_unrecognized) n += len(m.XXX_unrecognized)
} }
@ -3248,6 +3272,60 @@ func (m *Histogram) Unmarshal(dAtA []byte) error {
break break
} }
} }
case 16:
if wireType == 1 {
var v uint64
if (iNdEx + 8) > l {
return io.ErrUnexpectedEOF
}
v = uint64(encoding_binary.LittleEndian.Uint64(dAtA[iNdEx:]))
iNdEx += 8
v2 := float64(math.Float64frombits(v))
m.CustomValues = append(m.CustomValues, v2)
} else if wireType == 2 {
var packedLen int
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowTypes
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := dAtA[iNdEx]
iNdEx++
packedLen |= int(b&0x7F) << shift
if b < 0x80 {
break
}
}
if packedLen < 0 {
return ErrInvalidLengthTypes
}
postIndex := iNdEx + packedLen
if postIndex < 0 {
return ErrInvalidLengthTypes
}
if postIndex > l {
return io.ErrUnexpectedEOF
}
var elementCount int
elementCount = packedLen / 8
if elementCount != 0 && len(m.CustomValues) == 0 {
m.CustomValues = make([]float64, 0, elementCount)
}
for iNdEx < postIndex {
var v uint64
if (iNdEx + 8) > l {
return io.ErrUnexpectedEOF
}
v = uint64(encoding_binary.LittleEndian.Uint64(dAtA[iNdEx:]))
iNdEx += 8
v2 := float64(math.Float64frombits(v))
m.CustomValues = append(m.CustomValues, v2)
}
} else {
return fmt.Errorf("proto: wrong wireType = %d for field CustomValues", wireType)
}
default: default:
iNdEx = preIndex iNdEx = preIndex
skippy, err := skipTypes(dAtA[iNdEx:]) skippy, err := skipTypes(dAtA[iNdEx:])

2
prompb/types.proto
View file

@ -107,6 +107,8 @@ message Histogram {
// timestamp is in ms format, see model/timestamp/timestamp.go for // timestamp is in ms format, see model/timestamp/timestamp.go for
// conversion from time.Time to Prometheus timestamp. // conversion from time.Time to Prometheus timestamp.
int64 timestamp = 15; int64 timestamp = 15;
repeated double custom_values = 16;
} }
// A BucketSpan defines a number of consecutive buckets with their // A BucketSpan defines a number of consecutive buckets with their

157
storage/remote/otlptranslator/prometheusremotewrite/histograms.go
View file

@ -168,6 +168,7 @@ func convertBucketsLayout(buckets pmetric.ExponentialHistogramDataPointBuckets,
// The offset is scaled and adjusted by 1 as described above. // The offset is scaled and adjusted by 1 as described above.
bucketIdx := buckets.Offset()>>scaleDown + 1 bucketIdx := buckets.Offset()>>scaleDown + 1
spans = append(spans, prompb.BucketSpan{ spans = append(spans, prompb.BucketSpan{
Offset: bucketIdx, Offset: bucketIdx,
Length: 0, Length: 0,
@ -226,3 +227,159 @@ func convertBucketsLayout(buckets pmetric.ExponentialHistogramDataPointBuckets,
return spans, deltas return spans, deltas
} }
func (c *PrometheusConverter) addCustomBucketsHistogramDataPoints(ctx context.Context, dataPoints pmetric.HistogramDataPointSlice,
resource pcommon.Resource, settings Settings, promName string) (annotations.Annotations, error) {
var annots annotations.Annotations
for x := 0; x < dataPoints.Len(); x++ {
if err := c.everyN.checkContext(ctx); err != nil {
return annots, err
}
pt := dataPoints.At(x)
histogram, ws, err := histogramToCustomBucketsHistogram(pt)
annots.Merge(ws)
if err != nil {
return annots, err
}
lbls := createAttributes(
resource,
pt.Attributes(),
settings,
nil,
true,
model.MetricNameLabel,
promName,
)
ts, _ := c.getOrCreateTimeSeries(lbls)
ts.Histograms = append(ts.Histograms, histogram)
exemplars, err := getPromExemplars[pmetric.HistogramDataPoint](ctx, &c.everyN, pt)
if err != nil {
return annots, err
}
ts.Exemplars = append(ts.Exemplars, exemplars...)
}
return annots, nil
}
func histogramToCustomBucketsHistogram(p pmetric.HistogramDataPoint) (prompb.Histogram, annotations.Annotations, error) {
var annots annotations.Annotations
positiveSpans, positiveDeltas := convertHistogramBucketsToNHCBLayout(p.BucketCounts().AsRaw())
h := prompb.Histogram{
// The counter reset detection must be compatible with Prometheus to
// safely set ResetHint to NO. This is not ensured currently.
// Sending a sample that triggers counter reset but with ResetHint==NO
// would lead to Prometheus panic as it does not double check the hint.
// Thus we're explicitly saying UNKNOWN here, which is always safe.
// TODO: using created time stamp should be accurate, but we
// need to know here if it was used for the detection.
// Ref: https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/28663#issuecomment-1810577303
// Counter reset detection in Prometheus: https://github.com/prometheus/prometheus/blob/f997c72f294c0f18ca13fa06d51889af04135195/tsdb/chunkenc/histogram.go#L232
ResetHint: prompb.Histogram_UNKNOWN,
Schema: -53,
PositiveSpans: positiveSpans,
PositiveDeltas: positiveDeltas,
CustomValues: p.ExplicitBounds().AsRaw(),
Timestamp: convertTimeStamp(p.Timestamp()),
}
if p.Flags().NoRecordedValue() {
h.Sum = math.Float64frombits(value.StaleNaN)
h.Count = &prompb.Histogram_CountInt{CountInt: value.StaleNaN}
} else {
if p.HasSum() {
h.Sum = p.Sum()
}
h.Count = &prompb.Histogram_CountInt{CountInt: p.Count()}
if p.Count() == 0 && h.Sum != 0 {
annots.Add(fmt.Errorf("histogram data point has zero count, but non-zero sum: %f", h.Sum))
}
}
return h, annots, nil
}
func convertHistogramBucketsToNHCBLayout(buckets []uint64) ([]prompb.BucketSpan, []int64) {
if len(buckets) == 0 {
return nil, nil
}
var (
spans []prompb.BucketSpan
deltas []int64
count int64
prevCount int64
)
appendDelta := func(count int64) {
spans[len(spans)-1].Length++
deltas = append(deltas, count-prevCount)
prevCount = count
}
var offset int
for offset < len(buckets) && buckets[offset] == 0 {
offset++
}
bucketCounts := buckets[offset:]
bucketIdx := offset + 1
spans = append(spans, prompb.BucketSpan{
Offset: int32(offset),
Length: 0,
})
for i := 0; i < len(bucketCounts); i++ {
nextBucketIdx := offset + i + 1
if bucketIdx == nextBucketIdx { // We have not collected enough buckets to merge yet.
count += int64(bucketCounts[i])
continue
}
if count == 0 {
count = int64(bucketCounts[i])
continue
}
iDelta := nextBucketIdx - bucketIdx - 1
if iDelta > 2 {
spans = append(spans, prompb.BucketSpan{
Offset: int32(iDelta),
Length: 0,
})
} else {
// Either no gap or a gap <= 2
for j := int32(0); j < int32(iDelta); j++ {
appendDelta(0)
}
}
appendDelta(count)
count = int64(bucketCounts[i])
bucketIdx = nextBucketIdx
}
iDelta := int32(len(bucketCounts)+offset-1) + 1 - int32(bucketIdx)
if iDelta > 2 {
spans = append(spans, prompb.BucketSpan{
Offset: iDelta,
Length: 0,
})
} else {
for j := int32(0); j < iDelta; j++ {
appendDelta(0)
}
}
appendDelta(count)
return spans, deltas
}

20
storage/remote/otlptranslator/prometheusremotewrite/metrics_to_prw.go
View file

@ -40,6 +40,7 @@ type Settings struct {
AllowUTF8 bool AllowUTF8 bool
PromoteResourceAttributes []string PromoteResourceAttributes []string
KeepIdentifyingResourceAttributes bool KeepIdentifyingResourceAttributes bool
ConvertHistogramsToNHCB bool
} }
// PrometheusConverter converts from OTel write format to Prometheus remote write format. // PrometheusConverter converts from OTel write format to Prometheus remote write format.
@ -142,10 +143,21 @@ func (c *PrometheusConverter) FromMetrics(ctx context.Context, md pmetric.Metric
errs = multierr.Append(errs, fmt.Errorf("empty data points. %s is dropped", metric.Name())) errs = multierr.Append(errs, fmt.Errorf("empty data points. %s is dropped", metric.Name()))
break break
} }
if err := c.addHistogramDataPoints(ctx, dataPoints, resource, settings, promName); err != nil { if settings.ConvertHistogramsToNHCB {
errs = multierr.Append(errs, err) ws, err := c.addCustomBucketsHistogramDataPoints(ctx, dataPoints, resource, settings, promName)
if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) { annots.Merge(ws)
return if err != nil {
errs = multierr.Append(errs, err)
if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
return
}
}
} else {
if err := c.addHistogramDataPoints(ctx, dataPoints, resource, settings, promName); err != nil {
errs = multierr.Append(errs, err)
if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
return
}
} }
} }
case pmetric.MetricTypeExponentialHistogram: case pmetric.MetricTypeExponentialHistogram:

1
storage/remote/write_handler.go
View file

@ -581,6 +581,7 @@ func (rw *rwExporter) ConsumeMetrics(ctx context.Context, md pmetric.Metrics) er
AllowUTF8: otlpCfg.TranslationStrategy == config.NoUTF8EscapingWithSuffixes, AllowUTF8: otlpCfg.TranslationStrategy == config.NoUTF8EscapingWithSuffixes,
PromoteResourceAttributes: otlpCfg.PromoteResourceAttributes, PromoteResourceAttributes: otlpCfg.PromoteResourceAttributes,
KeepIdentifyingResourceAttributes: otlpCfg.KeepIdentifyingResourceAttributes, KeepIdentifyingResourceAttributes: otlpCfg.KeepIdentifyingResourceAttributes,
ConvertHistogramsToNHCB: otlpCfg.ConvertHistogramsToNHCB,
}) })
if err != nil { if err != nil {
rw.logger.Warn("Error translating OTLP metrics to Prometheus write request", "err", err) rw.logger.Warn("Error translating OTLP metrics to Prometheus write request", "err", err)