Setup

• Zabbix version: 7.4.2
• 3 VM with Ubuntu 24.04 (one for server, one for frontend, one for DB)
• DB: PostgreSQL 16 with TimescaleDB 2.19.3

Steps to Reproduce

• • Created a discovery rule named Discovery1 which scan 3 IP reachable and with a check ICMP Ping + Zabbix Agent (unencrypted) with key agent.hostname.
  • Added two discovery actions:
    • Action 1:
      Conditions:
      • Discovery object equals Service
      • Discovery rule equals Discovery1
      • Discovery status equals Down (or Lost, it has the same problem)
      • Service type equals Zabbix agent
        Operation: Add host tag agent: down
    • Action 2:
      Conditions:
      • Discovery object equals Service
      • Discovery rule equals Discovery1
      • Discovery status equals Discovered
      • Service type equals Zabbix agent
        Operation: Remove host tag agent: down

Result

• When the Zabbix agent check (service, not device) goes Down/Lost, Action 1 does not trigger (no tag added to the host when the service is down).
• Action 2 works correctly when the service is in status Discovered (I created the tag manually to check it)
• No relevant entries in Action Log for both actions.

Expected

• When the Zabbix agent check (service) goes down, the discovery action with Discovery status equals Down should trigger and add the host tag agent: down.