allow slash / in field name #4510
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Description
Log forwarders such as Vector, Fluentd ship Kubernetes logs with labels (https://kubernetes.io/docs/reference/labels-annotations-taints/#labels-annotations-and-taints-used-on-api-objects), which includes slash '/' character in field name. Although I can change slash to other supported character, but I think allowing slash / in field name will be better for shipping Kubernetes logs.