What are the default values for unreachable pollers in Zabbix?

The default values for unreachable pollers in Zabbix are crucial for the overall performance and reliability of monitoring systems. The correct values are defined in such a way to balance responsiveness and resource utilization effectively.

In this case, UnreachableDelay represents the period during which Zabbix will wait before marking a poller as unreachable. The value of 15 seconds strikes a good balance, allowing for transient network issues while still ensuring that problems are identified in a timely manner.

UnreachablePeriod defines how long Zabbix will consider a poller as unreachable before it tries to contact it again. A period of 45 seconds gives sufficient time to determine if a polling failure is due to a real issue rather than a temporary glitch.

Finally, UnavailableDelay, set to 60 seconds, is the time the system waits before finally marking the poller as unavailable. This value aids in preventing unnecessary alerts for brief outages or network delays.

These chosen defaults aim to optimize the monitoring process, ensuring that the system doesn't generate excessive alerts for short-term issues while still remaining responsive to genuine, persistent problems. The other options provided vary in their values and do not align with the proper defaults established for optimal Zabbix operation.