[exporter/awsemf] Drop metrics with Inf values (#29714)

Description: Metrics with Inf values for float types would cause the EMF
Exporter to error out during JSON Marshaling. This PR introduces a
change to drop metric values that contain Inf.

Link to tracking Issue: Fixes
#29336

Testing: Added unit tests at several different points with varying
levels of specificity. Unit tests are quite verbose in this example but
I have followed the format of existing tests while doing very little
refactoring.

Documentation: Update README

---------

Co-authored-by: bryan-aguilar <[email protected]>

.chloggen/awsemf_dropinf.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: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: awsemfexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: AWS EMF Exporter will drop metrics that contain Inf values to avoid JSON marshal errors.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [29336]
+
+# (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: [user]

exporter/awsemfexporter/README.md

@@ -22,7 +22,7 @@ and then sends them directly to CloudWatch Logs using the
 ## Data Conversion
 Convert OpenTelemetry ```Int64DataPoints```, ```DoubleDataPoints```, ```SummaryDataPoints``` metrics datapoints into 
 CloudWatch ```EMF``` structured log formats and send it to CloudWatch. Logs and Metrics will be displayed in 
-CloudWatch console. NaN values are not supported by CloudWatch EMF and will be dropped by the exporter.
+CloudWatch console. NaN, Inf values are not supported by CloudWatch EMF and will be dropped by the exporter.
 
 ## Exporter Configuration
 

exporter/awsemfexporter/datapoint.go

@@ -61,10 +61,10 @@ type dataPoints interface {
 	// retained: indicates whether the data point is valid for further process
 	// NOTE: It is an expensive call as it calculates the metric value.
 	CalculateDeltaDatapoints(i int, instrumentationScopeName string, detailedMetrics bool, calculators *emfCalculators) (dataPoint []dataPoint, retained bool)
-	// IsStaleOrNaN returns true if metric value has NoRecordedValue flag set or if any metric value contains a NaN.
-	// When return value is true, IsStaleOrNaN also returns the attributes attached to the metric which can be used for
+	// IsStaleNaNInf returns true if metric value has NoRecordedValue flag set or if any metric value contains a NaN or Inf.
+	// When return value is true, IsStaleNaNInf also returns the attributes attached to the metric which can be used for
 	// logging purposes.
-	IsStaleOrNaN(i int) (bool, pcommon.Map)
+	IsStaleNaNInf(i int) (bool, pcommon.Map)
 }
 
 // deltaMetricMetadata contains the metadata required to perform rate/delta calculation
@@ -149,13 +149,13 @@ func (dps numberDataPointSlice) CalculateDeltaDatapoints(i int, instrumentationS
 	return []dataPoint{{name: dps.metricName, value: metricVal, labels: labels, timestampMs: timestampMs}}, retained
 }
 
-func (dps numberDataPointSlice) IsStaleOrNaN(i int) (bool, pcommon.Map) {
+func (dps numberDataPointSlice) IsStaleNaNInf(i int) (bool, pcommon.Map) {
 	metric := dps.NumberDataPointSlice.At(i)
 	if metric.Flags().NoRecordedValue() {
 		return true, metric.Attributes()
 	}
 	if metric.ValueType() == pmetric.NumberDataPointValueTypeDouble {
-		return math.IsNaN(metric.DoubleValue()), metric.Attributes()
+		return math.IsNaN(metric.DoubleValue()) || math.IsInf(metric.DoubleValue(), 0), metric.Attributes()
 	}
 	return false, pcommon.Map{}
 }
@@ -179,12 +179,14 @@ func (dps histogramDataPointSlice) CalculateDeltaDatapoints(i int, instrumentati
 	}}, true
 }
 
-func (dps histogramDataPointSlice) IsStaleOrNaN(i int) (bool, pcommon.Map) {
+func (dps histogramDataPointSlice) IsStaleNaNInf(i int) (bool, pcommon.Map) {
 	metric := dps.HistogramDataPointSlice.At(i)
 	if metric.Flags().NoRecordedValue() {
 		return true, metric.Attributes()
 	}
-	if math.IsNaN(metric.Max()) || math.IsNaN(metric.Sum()) || math.IsNaN(metric.Min()) {
+	if math.IsNaN(metric.Max()) || math.IsNaN(metric.Sum()) ||
+		math.IsNaN(metric.Min()) || math.IsInf(metric.Max(), 0) ||
+		math.IsInf(metric.Sum(), 0) || math.IsInf(metric.Min(), 0) {
 		return true, metric.Attributes()
 	}
 	return false, pcommon.Map{}
@@ -272,14 +274,17 @@ func (dps exponentialHistogramDataPointSlice) CalculateDeltaDatapoints(idx int,
 	}}, true
 }
 
-func (dps exponentialHistogramDataPointSlice) IsStaleOrNaN(i int) (bool, pcommon.Map) {
+func (dps exponentialHistogramDataPointSlice) IsStaleNaNInf(i int) (bool, pcommon.Map) {
 	metric := dps.ExponentialHistogramDataPointSlice.At(i)
 	if metric.Flags().NoRecordedValue() {
 		return true, metric.Attributes()
 	}
 	if math.IsNaN(metric.Max()) ||
 		math.IsNaN(metric.Min()) ||
-		math.IsNaN(metric.Sum()) {
+		math.IsNaN(metric.Sum()) ||
+		math.IsInf(metric.Max(), 0) ||
+		math.IsInf(metric.Min(), 0) ||
+		math.IsInf(metric.Sum(), 0) {
 		return true, metric.Attributes()
 	}
 
@@ -343,19 +348,20 @@ func (dps summaryDataPointSlice) CalculateDeltaDatapoints(i int, instrumentation
 	return datapoints, retained
 }
 
-func (dps summaryDataPointSlice) IsStaleOrNaN(i int) (bool, pcommon.Map) {
+func (dps summaryDataPointSlice) IsStaleNaNInf(i int) (bool, pcommon.Map) {
 	metric := dps.SummaryDataPointSlice.At(i)
 	if metric.Flags().NoRecordedValue() {
 		return true, metric.Attributes()
 	}
-	if math.IsNaN(metric.Sum()) {
+	if math.IsNaN(metric.Sum()) || math.IsInf(metric.Sum(), 0) {
 		return true, metric.Attributes()
 	}
 
 	values := metric.QuantileValues()
 	for i := 0; i < values.Len(); i++ {
 		quantile := values.At(i)
-		if math.IsNaN(quantile.Value()) || math.IsNaN(quantile.Quantile()) {
+		if math.IsNaN(quantile.Value()) || math.IsNaN(quantile.Quantile()) ||
+			math.IsInf(quantile.Value(), 0) || math.IsInf(quantile.Quantile(), 0) {
 			return true, metric.Attributes()
 		}
 	}