fn merge_log_attributes(log: &mut Log, attrs: &[(String, LogAttribute)])Expand description
Merge attrs into log.attributes, letting existing keys win.
Tracing event fields are already present on the [Log] when the
before_send_log hook fires, so we must not overwrite them; this keeps
our CI/git metadata as a fallback that enriches (but never masks) the
log’s own attributes.