It adds a field containing the file name to the event. It is only applicable for input plugins k8s and file.
field cfg.FieldSelector default=file_name
The event field to which put the file name. Must be a string.
Warn: it overrides fields if it contains non-object type on the path. For example:
if field is info.level and input
{ "info": [{"userId":"12345"}] },
output will be: { "info": {"level": <level>} }
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