OptionalidExplicit array id; normally generated from nowMs.
OptionallaunchMin ms between launches. Passed to FanOut.
OptionalmaxMax instances running at once (0 = all at once). Passed to FanOut.
OptionalnameArray name; also the launched instances' name prefix. Default "array".
OptionalnowTime (ms epoch) used to stamp a generated id.
Options for building/launching a job array.