This will add audit_json.log that writes one line per audit event. For
example:
{
"severity":"INFO",
"time":"2018-10-17T17:38:22.523Z",
"author_id":3,
"entity_id":2,
"entity_type":"Project",
"change":"visibility",
"from":"Private",
"to":"Public",
"author_name":"John Doe4",
"target_id":2,
"target_type":"Project",
"target_details":"namespace2/project2"
}
