What logic does the conductor use to determine which node it starts the upgrade process on first for HA router pairs?

Unable to determine which router will be upgraded first in an HA pair when upgrades are performed from the Conductor.

The node with the inactive routing manager is upgraded first. 'show system processes' command shows you which is the primary vs inactive Routing Manager

Documentation references:

https://www.juniper.net/documentation/us/en/software/session-smart-router/docs/upgrade_ibu_conductor/#:~:text=High%20Availability%20Upgrades%E2%80%8B,command%20on%20the%20second%20node.

https://www.juniper.net/documentation/us/en/software/session-smart-router/docs/upgrade_router

https://www.juniper.net/documentation/us/en/software/session-smart-router/docs/concepts_ha_theoryofoperation/#:~:text=The%20SSR%20routing%20software%20presents%20several%20deployment,two%20logical%20routers,%20with%20no%20shared%20state.