Fix open-telemetry#314 - Cannot distinguish between sum being 0 and u…

…ndefined.
jsuereth · Oct 4, 2021 · 758741f · 758741f
1 parent e0f7d65
commit 758741f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/opentelemetry/proto/metrics/v1/metrics.proto b/opentelemetry/proto/metrics/v1/metrics.proto
@@ -442,7 +442,7 @@ message HistogramDataPoint {
   // Negative events *can* be recorded, but sum should not be filled out when
   // doing so.  This is specifically to enforce compatibility w/ OpenMetrics,
   // see: https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#histogram
-  double sum = 5;
+  optional double sum = 5;
 
   // bucket_counts is an optional field contains the count values of histogram
   // for each bucket.