Add metric.metadata for supporting additional metadata on metrics (#514)

* add metric.attributes for supporting additional metadata on metrics
open-telemetry · Feb 2, 2024 · c451441 · c451441
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -4,6 +4,13 @@
 
 Full list of differences found in [this compare](https://github.com/open-telemetry/opentelemetry-proto/compare/v1.1.0...main).
 
+### Added
+
+* Add metric.metadata for supporting additional metadata on metrics
+  [#514](https://github.com/open-telemetry/opentelemetry-proto/pull/514)
+
+### Changed
+
 ## 1.1.0 - 2024-01-10
 
 Full list of differences found in [this compare](https://github.com/open-telemetry/opentelemetry-proto/compare/v1.0.0...v1.1.0).

diff --git a/opentelemetry/proto/metrics/v1/metrics.proto b/opentelemetry/proto/metrics/v1/metrics.proto
@@ -188,6 +188,15 @@ message Metric {
     ExponentialHistogram exponential_histogram = 10;
     Summary summary = 11;
   }
+
+  // Additional metadata attributes that describe the metric. [Optional].
+  // Attributes are non-identifying.
+  // Consumers SHOULD NOT need to be aware of these attributes.
+  // These attributes MAY be used to encode information allowing
+  // for lossless roundtrip translation to / from another data model.
+  // Attribute keys MUST be unique (it is not allowed to have more than one
+  // attribute with the same key).
+  repeated opentelemetry.proto.common.v1.KeyValue metadata = 12;
 }
 
 // Gauge represents the type of a scalar metric that always exports the