Fix: Exempt "_bucket" suffix from PossibleNonCounterInfo warning (#12982)

Related to PR #12152

Signed-off-by: Julius Volz <julius.volz@gmail.com>

promql/functions.go

@@ -88,7 +88,11 @@ func extrapolatedRate(vals []parser.Value, args parser.Expressions, enh *EvalNod
 		return enh.Out, annos.Add(annotations.NewMixedFloatsHistogramsWarning(metricName, args[0].PositionRange()))
 	}
 
-	if isCounter && !strings.HasSuffix(metricName, "_total") && !strings.HasSuffix(metricName, "_sum") && !strings.HasSuffix(metricName, "_count") {
+	if isCounter &&
+		!strings.HasSuffix(metricName, "_total") &&
+		!strings.HasSuffix(metricName, "_sum") &&
+		!strings.HasSuffix(metricName, "_count") &&
+		!strings.HasSuffix(metricName, "_bucket") {
 		annos.Add(annotations.NewPossibleNonCounterInfo(metricName, args[0].PositionRange()))
 	}
 

util/annotations/annotations.go

@@ -105,7 +105,7 @@ var (
 	MixedFloatsHistogramsWarning        = fmt.Errorf("%w: encountered a mix of histograms and floats for metric name", PromQLWarning)
 	MixedClassicNativeHistogramsWarning = fmt.Errorf("%w: vector contains a mix of classic and native histograms for metric name", PromQLWarning)
 
-	PossibleNonCounterInfo                  = fmt.Errorf("%w: metric might not be a counter, name does not end in _total/_sum/_count:", PromQLInfo)
+	PossibleNonCounterInfo                  = fmt.Errorf("%w: metric might not be a counter, name does not end in _total/_sum/_count/_bucket:", PromQLInfo)
 	HistogramQuantileForcedMonotonicityInfo = fmt.Errorf("%w: input to histogram_quantile needed to be fixed for monotonicity (and may give inaccurate results) for metric name", PromQLInfo)
 )
 
@@ -157,7 +157,7 @@ func NewMixedClassicNativeHistogramsWarning(metricName string, pos posrange.Posi
 }
 
 // NewPossibleNonCounterInfo is used when a counter metric does not have the suffixes
-// _total, _sum or _count.
+// _total, _sum, _count, or _bucket.
 func NewPossibleNonCounterInfo(metricName string, pos posrange.PositionRange) annoErr {
 	return annoErr{
 		PositionRange: pos,