MW switch back date: Tue 14th Sept 2021
* Replication eqiad -> codfw is running
** [] s1
** [] s2
** [] s3
** [] s4
** [] s5
** [] s6 see T288594#7324150
** [] s7
** [] s8
** [x] x1
** [x] x2
** [x] es4
** [x] es5
** [] pc1
** [] pc2
** [] pc3
[] Check and disable GTID on eqiad masters for the above sections.
[] Check that all eqiad slaves have GTID enabled
[] Check which notifications are disabled for eqiad hosts
[] Check event scheduler is enabled on eqiad hosts
[] Check that query killers are installed and enabled on eqiad hosts
[] Update section_params in hieradata/common/profile/mariadb.yaml: https://gerrit.wikimedia.org/r/c/operations/puppet/+/719168
* Review DB MW weights
** [] s1
** [] s2
** [] s3
** [] s4
** [] s5
** [] s6
** [] s7
** [] s8
** [x] x1
** [x] x2
** [x] es4
** [x] es5
** [] pc1
** [] pc2
** [] pc3