Fix error details not being logged in the tracing's span event

The span event "error" logs a field called "error" that is expected to contain the error's details, but is instead displaying as a boolean on Honeycomb. This is causing us to miss some important information when debuging an error span.

This issue seems to be that a field called "error" is already definded as boolean. A solution would be to rename this field, in this specific span event, to something like "error.details" (we already have "error.id" and "error.kind").

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Fixed
+
+- Error tracing spans not logging the details.
+
 ## [6.45.20] - 2023-08-30
 ### Changed
 - Remove sampling decision from runtime

src/tracing/errorReporting/ErrorReport.ts

@@ -61,7 +61,7 @@ export class ErrorReport extends ErrorReportBase {
     }
 
     const serializableError = this.toObject()
-    span.log({ event: 'error', ...indexedLogs, error: serializableError })
+    span.log({ event: 'error', ...indexedLogs, 'error.details': serializableError })
 
     if (logger && this.shouldLogToSplunk(span)) {
       logger.error(serializableError)