Refactor: remove unused code

pkg/timeseries/align.go

@@ -158,71 +158,3 @@ func PrepareForStack(series []*TimeSeriesData) []*TimeSeriesData {
 
 	return series
 }
-
-// AlignSeriesIntervals aligns series to the same time interval
-func AlignSeriesIntervals(series []*TimeSeriesData) []*TimeSeriesData {
-	if len(series) == 0 {
-		return series
-	}
-
-	// Skip if interval not defined
-	for _, s := range series {
-		if s.Meta.Interval == nil {
-			return series
-		}
-	}
-
-	minInterval := *series[0].Meta.Interval
-	for _, s := range series {
-		if *s.Meta.Interval < minInterval {
-			minInterval = *s.Meta.Interval
-		}
-	}
-
-	// 0 interval means series is not aligned, so it's tricky to align multiple series
-	if minInterval == 0 {
-		return series
-	}
-
-	for _, s := range series {
-		if s.Len() < 2 || *s.Meta.Interval == minInterval {
-			continue
-		}
-
-		s.TS = s.TS.Interpolate(minInterval)
-	}
-
-	return series
-}
-
-func (ts TimeSeries) Interpolate(interval time.Duration) TimeSeries {
-	if interval <= 0 || ts.Len() < 2 {
-		return ts
-	}
-
-	alignedTs := NewTimeSeries()
-	var frameTs = ts[0].Time
-	var pointFrameTs time.Time
-	var point TimePoint
-	var nextPoint TimePoint
-
-	for i := 0; i < ts.Len()-1; i++ {
-		point = ts[i]
-		nextPoint = ts[i+1]
-		pointFrameTs = point.Time
-
-		if point.Value != nil && nextPoint.Value != nil {
-			frameTs = pointFrameTs.Add(interval)
-			for frameTs.Before(nextPoint.Time) {
-				pointValue := linearInterpolation(frameTs, point, nextPoint)
-				alignedTs = append(alignedTs, TimePoint{Time: frameTs, Value: &pointValue})
-				frameTs = frameTs.Add(interval)
-			}
-		}
-
-		alignedTs = append(alignedTs, TimePoint{Time: pointFrameTs, Value: point.Value})
-		frameTs = frameTs.Add(interval)
-	}
-
-	return alignedTs
-}