Creating label native-histogram-sample on the `cortex_discarded_sam…

…ples_total` to keep track of discarded native histogram samples (#5289)

* Create new reason on the discarted sample metric - native histogram

Signed-off-by: Alan Protasio <alanprot@gmail.com>

* fix build

Signed-off-by: Alan Protasio <alanprot@gmail.com>

* fix proto

Signed-off-by: Alan Protasio <alanprot@gmail.com>

* Resetting histogram

Signed-off-by: Alan Protasio <alanprot@gmail.com>

* changelog

Signed-off-by: Alan Protasio <alanprot@gmail.com>

---------

Signed-off-by: Alan Protasio <alanprot@gmail.com>

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## master / unreleased
 * [CHANGE] Alertmanager: Validating new fields on the PagerDuty AM config. #5290
+* [CHANGE] Ingester: Creating label `native-histogram-sample` on the `cortex_discarded_samples_total` to keep track of discarded native histogram samples. #5289
 * [BUGFIX] Ruler: Validate if rule group can be safely converted back to rule group yaml from protobuf message #5265
 * [BUGFIX] Querier: Convert gRPC `ResourceExhausted` status code from store gateway to 422 limit error. #5286
 * [BUGFIX] Alertmanager: Route web-ui requests to the alertmanager distributor when sharding is enabled. #5293

pkg/cortexpb/compat.go

@@ -21,7 +21,7 @@ import (
 
 // ToWriteRequest converts matched slices of Labels, Samples and Metadata into a WriteRequest proto.
 // It gets timeseries from the pool, so ReuseSlice() should be called when done.
-func ToWriteRequest(lbls []labels.Labels, samples []Sample, metadata []*MetricMetadata, source WriteRequest_SourceEnum) *WriteRequest {
+func ToWriteRequest(lbls []labels.Labels, samples []Sample, metadata []*MetricMetadata, histograms []Histogram, source WriteRequest_SourceEnum) *WriteRequest {
 	req := &WriteRequest{
 		Timeseries: PreallocTimeseriesSliceFromPool(),
 		Metadata:   metadata,
@@ -32,6 +32,9 @@ func ToWriteRequest(lbls []labels.Labels, samples []Sample, metadata []*MetricMe
 		ts := TimeseriesFromPool()
 		ts.Labels = append(ts.Labels, FromLabelsToLabelAdapters(lbls[i])...)
 		ts.Samples = append(ts.Samples, s)
+		if i < len(histograms) {
+			ts.Histograms = append(ts.Histograms, histograms[i])
+		}
 		req.Timeseries = append(req.Timeseries, PreallocTimeseries{TimeSeries: ts})
 	}