Wide events are plain old structured logs with many fields. They can be represented as JSON. They also can be represented as logfmt, protobuf or any other format suitable for representing a set of (field=value) pairs.

The novelty of wide events is that it is recommended to:

- emit an event (leg entry) once per every processed request. Previously it was OK to emit many logs per request. This could complicate degugging and analyzing such logs.

- don't afraid to add fields to the event if these fields can help debugging and/or analyzing the logs. Previously it was recommended artificially limiting the number of log fields to some small value. This could prevent from debugging and analyzing such logs in the future.