Initial CV-aligned infrastructure portfolio

Rework portfolio around Linux operations, Zabbix monitoring, migration validation, and ELK/Grafana log observability. Add AAP-style LVM resize workflow, Zabbix server/proxy/agent automation assets, Linux/AIX monitoring templates, and updated validation CI.
2026-05-04 17:37:24 +00:00
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+# Zabbix Proxy Design
+
+## Purpose
+
+Zabbix proxies reduce dependency on direct connectivity between the central server and monitored hosts. They are useful for client networks, segmented environments, remote sites, and maintenance windows.
+
+## Active Proxy
+
+- Proxy connects to the Zabbix server.
+- Good for restricted networks where inbound access to the proxy is not allowed.
+- Hosts can use active agent checks against the proxy.
+- Main operational checks: proxy last seen, delayed values, local DB size, config sync.
+
+## Passive Proxy
+
+- Zabbix server connects to the proxy.
+- Useful when central server can reach the proxy network.
+- Requires firewall rules from server to proxy.
+- Main operational checks: proxy listener, network latency, poller load.
+
+## Operational Signals
+
+- Proxy queue growth.
+- Unsupported items after template changes.
+- Agent unreachable or active checks delayed.
+- Proxy DB growth during WAN outage.
+- Config sync failures after maintenance.