feat(unreal): Add a stack trace from the crash context when there is no minidump

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 **Features**:
 
+- Add a stack trace from the crash context to Unreal crash reports without a minidump, such as those from Linux, behind the `projects:relay-unreal-crash-context-stacktrace` feature. ([#6581](https://github.com/getsentry/relay/pull/6581))
 - Implement support for splitting GPU dumps from CPU dumps for Unreal crash reports. ([#6583](https://github.com/getsentry/relay/pull/6583))
 - Retain client-provided exceptions in PlayStation crash events. ([#6594](https://github.com/getsentry/relay/pull/6594))
 - Update device classification for new iPhone and iPad models. ([#6595](https://github.com/getsentry/relay/pull/6595))

relay-dynamic-config/src/feature.rs

@@ -97,6 +97,9 @@ pub enum Feature {
     /// Enable Nintendo event rewrite.
     #[serde(rename = "projects:relay-nintendo-event-rewrite")]
     NintendoEventRewrite,
+    /// Add a stack trace from the Unreal crash context to crashes without a minidump.
+    #[serde(rename = "projects:relay-unreal-crash-context-stacktrace")]
+    UnrealCrashContextStacktrace,
     /// Stream minidumps to objectstore.
     #[serde(rename = "projects:relay-minidump-uploads")]
     MinidumpUploads,

relay-server/src/processing/errors/integrations/unreal.rs

@@ -88,9 +88,19 @@ fn convert(
         .get_header(crate::constants::UNREAL_USER_HEADER)
         .and_then(|v| v.as_str());
 
-    let report =
-        crate::utils::process_unreal(context, event_id, &mut event, &attachments, user_header)
-            .map_err(ProcessingError::InvalidUnrealReport)?;
+    let context_stacktrace = ctx
+        .project_info
+        .has_feature(Feature::UnrealCrashContextStacktrace);
+
+    let report = crate::utils::process_unreal(
+        context,
+        event_id,
+        &mut event,
+        &attachments,
+        user_header,
+        context_stacktrace,
+    )
+    .map_err(ProcessingError::InvalidUnrealReport)?;
 
     let mut intermediates = Intermediates::default();