Additional information about a potentially long-running operation associated with the log entry.
Some operations, such as an HTTP function call or a scheduled task, include
several log entries. The operation object lets you identify all log entries
associated with a specific operation via the operation ID, which is unique
to each operation.
You can also use the producer property to identify the context of the
operation, such as a URL path for page code or an HTTP function name.
Note: Currently only applicable for log entries with the Velo namespace.