$formatFields
$formatFields :
Format descriptor for PHP event/error/exception logging.
setFieldAttribute(string $field_name, string $attribute_name, string $value)
| string | $field_name | ID of log format field. | 
| string | $attribute_name | Name of the DescriptorField attribute ("name", because it serves as an ID, is immutable). | 
| string | $value | Value to assign the DescriptorField attribute for the desired field ID. | 
getInstance(array|mixed|null  $inject = null) : \phpWTL\$_instance[$class]
                Create new instance or give back already existing one.
| array|mixed|null | $inject | Can be used to inject one or more parameter(s) into the constructor | 
The instance of a derived class
__construct(object|null  $inject = null) 
                Set format prefix and create all format field descriptors in their proper sequence (array of DescriptorField objects):
timestamp, message, loglevel_caption, loglevel, context_data
| object|null | $inject | Can be used to inject one or more parameter(s) into the constructor |