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Clarify aggregation temporality for Summary metric type #591

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Oct 1, 2024
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Clarify aggregation temporality for Summary metric type #591

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6 changes: 5 additions & 1 deletion opentelemetry/proto/metrics/v1/metrics.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -268,6 +268,9 @@ message ExponentialHistogram {
// data type. These data points cannot always be merged in a meaningful way.
// While they can be useful in some applications, histogram data points are
// recommended for new applications.
// Summary metrics do not have an aggregation temporality field. This is
// because the count and sum fields of a SummaryDataPoint are assumed to be
// cumulative values.
message Summary {
repeated SummaryDataPoint data_points = 1;
}
Expand Down Expand Up @@ -606,7 +609,8 @@ message ExponentialHistogramDataPoint {
}

// SummaryDataPoint is a single data point in a timeseries that describes the
// time-varying values of a Summary metric.
// time-varying values of a Summary metric. The count and sum fields represent
// cumulative values.
message SummaryDataPoint {
reserved 1;

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