Gatling: meaning of all fields in simulation.log file

Missing recordType:

[scenario][userId][recordType][groupHierarchy][name][first/last byte sent timestamp][first/last byte received timestamp][status][extraInfo]

Regarding groups, see documentation: https://github.com/excilys/gatling/wiki/Structure-Elements#group

I will quote answer of Gatling Lead Developer from 09/10/2015:

simulation.log format is not documented for a good reason: it's not a public API and is subject to frequent changes.