At {T397425} we had to patch our current 10.6.22 and 10.11.13 with an update as we were bitten by https://jira.mariadb.org/browse/MDEV-36934
Today for {T399446} as the primary wasn't patched we got bitten and the switchover had to be finished manually, as it failed when inverting replication.
Masters progress:
[x] db1151.eqiad.wmnet
[x] db1152.eqiad.wmnet
[x] db1153.eqiad.wmnet
[x] db1163.eqiad.wmnet
[ ] db1176.eqiad.wmnet (test host)
[x] db1193.eqiad.wmnet
[x] db1201.eqiad.wmnet
[x] db1204.eqiad.wmnet
[x] db1210.eqiad.wmnet
[x] db1213.eqiad.wmnet
[x] db1215.eqiad.wmnet (zarcillo)
[x] db1220.eqiad.wmnet
[x] db1222.eqiad.wmnet
[x] db1223.eqiad.wmnet
[x] db1228.eqiad.wmnet
[x] db1236.eqiad.wmnet
[x] db1244.eqiad.wmnet
[x] db1250.eqiad.wmnet
[x] db1255.eqiad.wmnet
[x] es1035.eqiad.wmnet
[x] es1038.eqiad.wmnet
[x] pc1011.eqiad.wmnet
[x] pc1012.eqiad.wmnet
[x] pc1013.eqiad.wmnet
[x] pc1014.eqiad.wmnet
[x] pc1015.eqiad.wmnet
[x] pc1016.eqiad.wmnet
[x] pc1017.eqiad.wmnet
[x] pc1018.eqiad.wmnet
[x] db2142.codfw.wmnet
[x] db2143.codfw.wmnet
[x] db2144.codfw.wmnet
[x] db2151.codfw.wmnet
[x] db2165.codfw.wmnet
[x] db2179.codfw.wmnet
[x] db2183.codfw.wmnet
[x] db2196.codfw.wmnet
[x] db2203.codfw.wmnet
[x] db2204.codfw.wmnet
[x] db2209.codfw.wmnet
[x] db2213.codfw.wmnet
[x] db2214.codfw.wmnet
[x] db2218.codfw.wmnet
[x] db2232.codfw.wmnet
[x] db2233.codfw.wmnet
[x] db2234.codfw.wmnet
[x] db2235.codfw.wmnet
[x] db2241.codfw.wmnet
[x] es2037.codfw.wmnet
[x] es2038.codfw.wmnet
[x] pc2011.codfw.wmnet
[x] pc2012.codfw.wmnet
[x] pc2013.codfw.wmnet
[x] pc2014.codfw.wmnet
[x] pc2015.codfw.wmnet
[x] pc2016.codfw.wmnet
[x] pc2017.codfw.wmnet
[x] pc2018.codfw.wmnet