Add script to fill event log gaps manually

See merge request gitlab-com/migration!201

This reverts commit bdbe3dd6.

Will check replication status on all secondaries as well.

Closes #764

See merge request gitlab-com/migration!200

No longer suppress errors

See merge request gitlab-com/migration!199

It was done this way originally to remove ssh warnings but after
discussion it was decided it is better to show everything for
troubleshooting.

Count and display the number of specific background migration jobs

See merge request gitlab-com/migration!198

Address feedback from 2018-08-09 failover attempt

See merge request gitlab-com/migration!197

Jarv/db scripts

See merge request gitlab-com/migration!196

Use prometheus metrics for monitoring geo numbers

See merge request gitlab-com/migration!195

Inverse unicorn and redis steps in failback

See merge request gitlab-com/migration!194

Restarting unicorn may resolve an issue about redis expecting to be a master but being a slave, so we should do that first

Copy of the staging script to allow gprd access

See merge request gitlab-com/migration!193

This is just a copy with find and replace. We'll need something like
this for the During Blackout QA.

Merge branch '748-start-failover-procedure-sh-has-to-be-run-from-migration-dir-make-more-generic' into 'master'

Resolve "'start-failover-procedure.sh' has to be run from 'migration' dir, make more generic"

Closes #748

See merge request gitlab-com/migration!192

Feedback from the 2018-08-07 failover attempt

See merge request gitlab-com/migration!191

Fixes the command that changes Shared Runners timeout.

See merge request gitlab-com/migration!184

Add comms handler steps for youtube and status.io

See merge request gitlab-com/migration!190

Move T-0 to "Prevent updates to the primary"

Closes #743

See merge request gitlab-com/migration!186

Fix the criteria for an alert silence

See merge request gitlab-com/migration!183

Resolve "Add step to kill queue disabling loop after sidekiq is stopped"

Closes #752

See merge request gitlab-com/migration!189

Resolve "Update failover templates with proper script references"

Closes #756

See merge request gitlab-com/migration!188

fix list of domains for hostinfo

See merge request gitlab-com/migration!187

Address (some) feedback from 2018-08-02 failover attempt

Closes #753

See merge request gitlab-com/migration!176