SaaS-only SIEM fails the moment it assumes connectivity that doesn't exist. Air-gapped military networks. OT-isolated pipelines and power grids. Government research enclaves. Hard data residency mandates across the EU, GCC, and beyond. In each case the issue isn't the product — it's the architecture. New post: the four environments where cloud-first SIEM structurally cannot operate, and what actually works instead → https://graylog.org/post/the-four-environments-where-saas-only-siem-fails/ #InfoSec #SIEM #OTSecurity #DataSovereignty