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> Is there an open source version of splunk I can modify?

https://github.com/grafana/loki might work for you. It’s not a drop in replacement for Splunk, FWIW.

Is there any way to do subqueries (or some kind of join) with loki? That is one feature of splunk I haven't seen elsewhere, open source or not.

New Relic’s NRQL can do sub queries.