POTEL 35 - Use OtelSpan name as fallback for transaction name (#3557)

* use otel span name if sentrySpan exists but description is null

* Format code

* changelog

* fix build

---------

Co-authored-by: Sentry Github Bot <bot+github-bot@sentry.io>
Co-authored-by: Alexander Dinauer <alexander.dinauer@sentry.io>

Author: 3 people

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## Unreleased
+
+### Fixes
+
+- Use OpenTelemetry span name as fallback for transaction name ([#3557](https://github.com/getsentry/sentry-java/pull/3557))
+  - In certain cases we were sending transactions as "<unlabeled transaction>" when using OpenTelemetry 
+
 ## 8.0.0-alpha.4
 
 ### Fixes

sentry-opentelemetry/sentry-opentelemetry-core/src/main/java/io/sentry/opentelemetry/SpanDescriptionExtractor.java

@@ -66,7 +66,9 @@ private OtelSpanInfo extractSpanDescription(
     }
 
     final @NotNull String name = otelSpan.getName();
-    final @Nullable String description = sentrySpan != null ? sentrySpan.getDescription() : name;
+    final @Nullable String maybeDescription =
+        sentrySpan != null ? sentrySpan.getDescription() : name;
+    final @NotNull String description = maybeDescription != null ? maybeDescription : name;
     return new OtelSpanInfo(name, description, TransactionNameSource.CUSTOM);
   }