Add condition with sum and count for Prometheus summaries (#3059)

open-telemetry · Jan 23, 2023 · 3d59458 · 3d59458
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -112,6 +112,8 @@ release.
 - Add OpenCensus migration guide and add BinaryPropagation as an option to gRPC
   instrumentation for OpenCensus compatibility
   ([#3015](https://github.com/open-telemetry/opentelemetry-specification/pull/3015)).
+- Add condition with sum and count for Prometheus summaries
+([3059](https://github.com/open-telemetry/opentelemetry-specification/pull/3059))
 
 ### OpenTelemetry Protocol
 

diff --git a/specification/compatibility/prometheus_and_openmetrics.md b/specification/compatibility/prometheus_and_openmetrics.md
@@ -103,6 +103,8 @@ Multiple Prometheus metrics are merged together into a single OTLP Summary:
 
 * The `quantile` label on non-suffixed metrics is used to identify quantile points in summary metrics. Each Prometheus line produces one quantile on the resulting summary.
 * Lines with `_count` and `_sum` suffixes are used to determine the summary's count and sum.
+* If `_count` is not present, the metric MUST be dropped.
+* If `_sum` is not present, the summary's sum MUST be [set to zero.](https://github.com/open-telemetry/opentelemetry-proto/blob/d8729d40f629dba12694b44c4c32c1eab109b00a/opentelemetry/proto/metrics/v1/metrics.proto#L601)
 
 ### Dropped Types