Lower the deployment apdex SLO for the git service

Bob Van Landuytrequested to merge
bvl-lower-deployment-slo-for-git into master

This lowers the deployment SLO from 0.9995 to 0.999, which is still tighter than the 0.998 SLO we use for alerting.

The reason for this is that the deployment SLO cannot take into account customized SLOs specified on specific components in the service. We've added the rails_requests service, and lowered the SLO for that particular component while we work on improving the signal (gitlab-com/gl-infra/scalability#1343).

This came to light in a recent incident: gitlab-com/gl-infra/production#6230 (closed) in which the service would not meet the 0.9995 target and then block a deploy or a feature flag roll out.

We should tighten this again after we've found the root cause of slowdown in requests. But in the mean time, we should not block deploys or feature flag roll outs because of it.

Edited by Bob Van Landuyt

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