The data path: one tag value from machine to on-call person

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Flow in seven hops: a machine tag changes on an OPC UA server; Telegraf at the edge reads it; EMQX queues and forwards it, buffering if the link is down; it crosses to Google Cloud through Pub/Sub over outbound HTTPS; the ingest Telegraf pulls it and acknowledges only after the TimescaleDB insert; Drasi notices the excursion through a continuous query; Alertmanager pages the on-call person and asks kagent for advice.