Add event_name to logs proto (#600)

* Add event_name to log proto

CHANGELOG.md

@@ -4,6 +4,10 @@
 
 The full list of changes can be found in the compare view for the respective release at <https://github.com/open-telemetry/opentelemetry-proto/releases>.
 
+### Added
+
+- logs: Add top-level `event_name` field to log records instead of `event.name` attribute. [#600](https://github.com/open-telemetry/opentelemetry-proto/pull/600)
+
 ## 1.4.0 - 2024-11-20
 
 ### Added

opentelemetry/proto/logs/v1/logs.proto

@@ -210,4 +210,18 @@ message LogRecord {
   //   - the field is not present,
   //   - the field contains an invalid value.
   bytes span_id = 10;
+
+  // A unique identifier of event category/type.
+  // All events with the same event_name are expected to conform to the same
+  // schema for both their attributes and their body.
+  //
+  // Recommended to be fully qualified and short (no longer than 256 characters).
+  //
+  // Presence of event_name on the log record identifies this record
+  // as an event.
+  //
+  // [Optional].
+  //
+  // Status: [Development]
+  string event_name = 12;
 }