metricstarttimeprocessor: add subtractinitial strategy implementation

This change addresses open-telemetry#38379.

Author: ridwanmsharif

.chloggen/decouple-cache.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: metricstarttimeprocessor
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Decouples the cache from the strategies for adjusting
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [38382]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

processor/metricstarttimeprocessor/internal/datapointstorage/timeseries_map.go

@@ -101,6 +101,7 @@ func (tsm *TimeseriesMap) GC() {
 	tsm.Mark = false
 }
 
+<<<<<<< HEAD
 // IsResetHistogram compares the given histogram datapoint h, to tsi.Histogram
 // and determines whether the metric has been reset based on the values.  It is
 // a reset if any of the bucket boundaries have changed, if any of the bucket
@@ -110,6 +111,13 @@ func (tsi *TimeseriesInfo) IsResetHistogram(h pmetric.HistogramDataPoint) bool {
 		return true
 	}
 	if h.Sum() < tsi.Histogram.Sum() {
+=======
+func (tsi *TimeseriesInfo) IsResetHistogram(h pmetric.HistogramDataPoint) bool {
+	if h.Count() != 0 && tsi.Histogram.Count() != 0 && h.Count() < tsi.Histogram.Count() {
+		return true
+	}
+	if h.Sum() != 0 && tsi.Histogram.Sum() != 0 && h.Sum() < tsi.Histogram.Sum() {
+>>>>>>> a9034e93c8 (metricstarttimeprocessor: add reset detection for histograms)
 		return true
 	}
 
@@ -137,6 +145,7 @@ func (tsi *TimeseriesInfo) IsResetHistogram(h pmetric.HistogramDataPoint) bool {
 	return false
 }
 
+<<<<<<< HEAD
 // IsResetExponentialHistogram compares the given exponential histogram
 // datapoint eh, to tsi.ExponentialHistogram and determines whether the metric
 // has been reset based on the values.  It is a reset if any of the bucket
@@ -148,6 +157,14 @@ func (tsi *TimeseriesInfo) IsResetExponentialHistogram(eh pmetric.ExponentialHis
 		return true
 	}
 	if eh.Sum() < tsi.ExponentialHistogram.Sum() {
+=======
+func (tsi *TimeseriesInfo) IsResetExponentialHistogram(eh pmetric.ExponentialHistogramDataPoint) bool {
+	// Same as the histogram implementation
+	if eh.Count() != 0 && tsi.ExponentialHistogram.Count() != 0 && eh.Count() < tsi.ExponentialHistogram.Count() {
+		return true
+	}
+	if eh.Sum() != 0 && tsi.ExponentialHistogram.Sum() != 0 && eh.Sum() < tsi.ExponentialHistogram.Sum() {
+>>>>>>> a9034e93c8 (metricstarttimeprocessor: add reset detection for histograms)
 		return true
 	}
 
@@ -177,6 +194,7 @@ func (tsi *TimeseriesInfo) IsResetExponentialHistogram(eh pmetric.ExponentialHis
 	return false
 }
 
+<<<<<<< HEAD
 // IsResetSummary compares the given summary datapoint s to tsi.Summary and
 // determines whether the metric has been reset based on the values.  It is a
 // reset if the count or sum has decreased.
@@ -187,6 +205,13 @@ func (tsi *TimeseriesInfo) IsResetSummary(s pmetric.SummaryDataPoint) bool {
 // IsResetSum compares the given number datapoint s to tsi.Number and determines
 // whether the metric has been reset based on the values.  It is a reset if the
 // value has decreased.
+=======
+func (tsi *TimeseriesInfo) IsResetSummary(s pmetric.SummaryDataPoint) bool {
+	return (s.Count() != 0 && tsi.Summary.Count() != 0 && s.Count() < tsi.Summary.Count()) ||
+		(s.Sum() != 0 && tsi.Summary.Sum() != 0 && s.Sum() < tsi.Summary.Sum())
+}
+
+>>>>>>> a9034e93c8 (metricstarttimeprocessor: add reset detection for histograms)
 func (tsi *TimeseriesInfo) IsResetSum(s pmetric.NumberDataPoint) bool {
 	return s.DoubleValue() < tsi.Number.DoubleValue()
 }