One approach is to use open source log management tools like Fluentd so that you can unify and simplify your logging layer. Using the output plugins for Splunk and Amazon S3, you can send same data to both Splunk and S3. You can learn more about Fluentd and its enterprise offering below:
https://www.fluentd.org
https://fluentd.treasuredata.com
https://fluentd.treasuredata.com/splunk-optimize/
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