logger_json v5.1.2

LoggerJSON.Formatters.GoogleCloudLogger.format_event

You're seeing just the function format_event, go back to LoggerJSON.Formatters.GoogleCloudLogger module for more information.
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format_event(arg1, msg, ts, md, md_keys, formatter_state)

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Builds structured payload which is mapped to Google Cloud Logger LogEntry format.

See: https://cloud.google.com/logging/docs/agent/configuration#special_fields_in_structured_payloads