Description of problem:
nove evacuate littlers the log at every monitor() operation:
May 01 19:36:48 database-0.redhat.local pacemaker-execd[12359]:  notice: nova-evacuate_monitor_10000:167827:stderr [ Could not query value of evacuate: attribute does not exist ] 
May 01 19:36:58 database-0.redhat.local pacemaker-execd[12359]:  notice: nova-evacuate_monitor_10000:168060:stderr [ Could not query value of evacuate: attribute does not exist ] 
May 01 19:37:08 database-0.redhat.local pacemaker-execd[12359]:  notice: nova-evacuate_monitor_10000:168289:stderr [ Could not query value of evacuate: attribute does not exist ] 
May 01 19:37:18 database-0.redhat.local pacemaker-execd[12359]:  notice: nova-evacuate_monitor_10000:168518:stderr [ Could not query value of evacuate: attribute does not exist ] 

That is because we do not redirect stderr to dev null when we call attrd_updater"
evacuate_monitor() {   
    if [ ! -f "$statefile" ]; then
        return $OCF_NOT_RUNNING
    fi  
 
    handle_evacuations $(      
        attrd_updater -n evacuate -A |
            sed 's/ value=""/ value="no"/' |
            tr '="' '  ' |     
            awk '{print $4" "$6}'
    )                  
    return $OCF_SUCCESS
}


So the fix here would be using:
attrd_updater -n evacuate -A 2>/dev/null |

Remind on Monday where the git of this resides and I'll post proper PR and test it ;)