Will using a non-Cisco branded SFP module void any warranty with Cisco (either with the switch or network module)?
The SFP we are looking for more cost effective alternatives is SFP-10G-SR-S in a C9300-NM-8X.
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Generally third party optics will not void Cisco's warranty but are also considered unsupported. In practice this means that if TAC sees an issue potentially associated with a third party optic in the box that they may ask you to swap in an actual Cisco part in the interest of troubleshooting. If the underlying issue has nothing to do with optics in the box then it's a non-issue.
One notable exception are optics modules that don't have a direct equivalent in the Cisco catalog. As an example I'd be really cautious with 10GBaseT SFP's, as the earlier generations (...which Cisco and most of its competitors refused to sell) could draw enough power to either damage supply circuitry or cause significant thermal problems. Similarly extra long-distance fiber modules that draw excessive power could cause failures. I'd imagine the failure mode would have to be something pretty egregious (i.e. something burning down) before there would be a question.