11. Enable the runner-managers on the XL shard

Prepare

• Increase the concurrency to 750 👉 https://gitlab.com/gitlab-com/gl-infra/chef-repo/-/blob/master/roles/runners-manager-saas-linux-xlarge-amd64.json?ref_type=heads#L19
• Mention @sre-oncall in #production with a FYI message, letting them know you're about to enable a new runner's shard, and if timing is OK for that.
• Monitor https://dashboards.gitlab.net/d/ci-runners-deployment/ci-runners-deployment-overview?orgId=1.

Execute

• /runner run start saas-linux-xlarge-amd64 green in #2635 (closed)

Verify

• Verify the new shard xlarge is starting to report traffic in the Grafana dashboard above ☝
• Look at the logs to verify jobs are getting picked 👉 https://log.gprd.gitlab.net/app/r/s/DVD1w
• Ensure the Apdex is healthy with no newly reported errors 👉 https://dashboards.gitlab.net/goto/tqXJayj4R?orgId=1

If things go south

• Verify there's no errors, if any, stop the fleet: /runner run stop saas-linux-xlarge-amd64 green