trace property

Optional. The REST resource name of the trace being written to Cloud Trace in association with this log entry. For example, if your trace data is stored in the Cloud project "my-trace-project" and if the service that is creating the log entry receives a trace header that includes the trace ID "12345", then the service should use "projects/my-tracing-project/traces/12345".

The trace field provides the link between logs and traces. By using this field, you can navigate from a log entry to a trace.