As of now, Resmoke prefixes the structured log output of mongod / mongos processes with some process information. E.g.: "[j3:s1:prim] ".

When Resmoke is run with --outputFormat=json (see SERVER-97956), this information should be added to the server process structured log lines under "attr", e.g.,

{..., "attr": {..., "pInfo": {"j": 3, "s": 2, port: 20752}}}..

The example above adds an additional JSON attribute "pInfo" (short for "process information"). Adding this information to "attr" is in-line with JSON log output format and should minimize the differences between analyzing Resmoke and plain server logs.