I intend to contribute to Suri, is there a resource that shows things like architectural diagrams to get up to speed with how the software works.
I guess 25. Suricata Developer Guide — Suricata 7.0.0-rc2-dev documentation and Suricata - Suricata - Open Information Security Foundation are the best we have so far, cc @jufajardini
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Disclaimer: the dev documentation is a work in progress at the moment. 
We also have suricata: Doxygen documentation