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Ok so I got something working. First I have to create a record in the Flow. spec: filters: - record_transformer: enable_ruby: true records: - namespace_name: ${record['kubernetes']['namespace_name']} Then I have to add it to a buffer in the Output(no idea what this actually does): spec: s3: buffer: tags: namespace_name, tag, time Then I can use it in the path: path: /logs/${namespace_name}/