For a detailed explanation of agent updates, see Agent Updates.
If an agent only has an IPv6 address, read the IPv6 limitations for agent updates in Pure IPv6 Agent Limitations.
Apply to All Agents: Applies settings to all existing agents and to any new agent added to an existing/future group. Future groups are groups not yet created at the time you configure the settings.
Apply to Future Groups Only: Applies settings only to agents added to future groups. This option will not apply settings to new agents added to an existing group.