pool member monitor versus pool monitor

Not sure if this behavior has changed now. When I apply node-specific monitor and NOT pool monitor, my pool remains blue. Shouldn't pool be green if each member in node-view shows each member green?

No. Node specific monitors can only mark a pool member down. The posts above are regarding pool member monitors, which are a different object. Using your code, if you had this:

ltm pool prd-pl-vsp_mdm {
    members {
        prd-pl-vsp1:any {
            address 172.26.225.100
            priority-group 1
            session monitor-enabled
            monitor Server-Monitor-8443
            state up
        }
        prd-pl-vsp2:any {
            address 172.26.225.101
            session monitor-enabled
            monitor Server-Monitor-8443
            state up
        }
    }
    min-active-members 1
    monitor none
}

This would work correctly and should bring up the pool.