feat(opentelemetry source): Include source_type on logs received by opentelemetry source (#13939)

* feat(opentelemetry source): Include source_type on logs received by opentelemetry source

* trigger ci

* +update unit test

Author: spencergilbert

src/opentelemetry/convert.rs

@@ -139,6 +139,8 @@ impl From<ResourceLog> for Event {
             rl.log_record.dropped_attributes_count,
         );
 
+        le.insert(log_schema().source_type_key(), Bytes::from("opentelemetry"));
+
         le.into()
     }
 }

src/sources/opentelemetry/tests.rs

@@ -116,6 +116,7 @@ async fn receive_grpc_logs() {
             ("dropped_attributes_count", 3.into()),
             ("timestamp", Utc.timestamp_nanos(1).into()),
             ("observed_timestamp", Utc.timestamp_nanos(2).into()),
+            ("source_type", "opentelemetry".into()),
         ]);
         let expect_event = Event::from(LogEvent::from(expect_vec));
         assert_eq!(actual_event, expect_event);