Zabbix 6 Migration

Moving 3,000+ hosts and 400+ templates to the new version with zero downtime, and simplifying the templates.

We made a risk-free transition with a migration plan, a parallel-run period and automated validation scripts.

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A platform that unifies 14 scattered Prometheus servers into a single query layer with Thanos and retains 13 months of metrics.

Routing in Alertmanager by team, severity and service ownership; grouping of recurring alerts.