gistfile1.txt

root@saltCastle:/srv/salt# salt '*' mine.get 'roles:appserver' network.ip_addrs grain
appserver01:
    ----------
    appserver01:
        - 104.236.105.114
    appserver02:
        - 104.236.118.78
    appserver03:
        - 45.55.218.184
appserver02:
    ----------
    appserver01:
        - 104.236.105.114
    appserver02:
        - 104.236.118.78
    appserver03:
        - 45.55.218.184
nginx-rproxy:
    ----------
    appserver01:
        - 104.236.105.114
    appserver02:
        - 104.236.118.78
    appserver03:
        - 45.55.218.184
It seems appserver01, appserver02, and nginx-rproxy all remember the IP of appserver03, even though it is no longer running and doesn't exist.

gistfile2.txt

root@saltCastle:/srv/salt# salt '*' mine.flush
appserver01:
    True
appserver02:
    True
nginx-rproxy:
    True

Trying to flush the mine contents

gistfile3.txt

root@saltCastle:/srv/salt# salt '*' mine.get 'roles:appserver' network.ip_addrs grain
nginx-rproxy:
    ----------
    appserver03:
        - 45.55.218.184
appserver01:
    ----------
    appserver03:
        - 45.55.218.184
appserver02:
    ----------
    appserver03:
        - 45.55.218.184

It seems they all flushed everything for the servers still running, but left the info for appserver03.