feat(event-schema): Look up data attributes in tags (#3751)

SDKs send certain attributes in `span.tags` rather than `span.data`. To
consolidate access and make all data accessible via a single key, this
PR makes the getter implementation on spans fall back to `tags` if a key
is not present on `data`.

CHANGELOG.md

@@ -16,6 +16,7 @@
 - Improve flush time calculation in metrics aggregator. ([#3726](https://github.com/getsentry/relay/pull/3726))
 - Default `client` of `RequestMeta` to `relay-http` for incoming monitor requests. ([#3739](https://github.com/getsentry/relay/pull/3739))
 - Normalize events once in the ingestion pipeline, relying on item headers. ([#3730](https://github.com/getsentry/relay/pull/3730))
+- Provide access to values in `span.tags.*` via `span.data.*`. This serves as an opaque fallback to consolidate data attributes. ([#3751](https://github.com/getsentry/relay/pull/3751))
 
 ## 24.5.1
 

relay-event-schema/src/protocol/span.rs

@@ -112,6 +112,19 @@ pub struct Span {
     pub other: Object<Value>,
 }
 
+impl Span {
+    /// Returns the value of an attribute on the span.
+    ///
+    /// This primarily looks up the attribute in the `data` object, but falls back to the `tags`
+    /// object if the attribute is not found.
+    fn attribute(&self, key: &str) -> Option<Val<'_>> {
+        Some(match self.data.value()?.get_value(key) {
+            Some(value) => value,
+            None => self.tags.value()?.get(key)?.as_str()?.into(),
+        })
+    }
+}
+
 impl Getter for Span {
     fn get_value(&self, path: &str) -> Option<Val<'_>> {
         let span_prefix = path.strip_prefix("span.");
@@ -136,7 +149,7 @@ impl Getter for Span {
                     if let Some(key) = path.strip_prefix("tags.") {
                         self.tags.value()?.get(key)?.as_str()?.into()
                     } else if let Some(key) = path.strip_prefix("data.") {
-                        self.data.value()?.get_value(key)?
+                        self.attribute(key)?
                     } else if let Some(key) = path.strip_prefix("sentry_tags.") {
                         self.sentry_tags.value()?.get(key)?.as_str()?.into()
                     } else if let Some(rest) = path.strip_prefix("measurements.") {