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refactor(saturation): gitaly active node available

Steve Xuereb requested to merge refactor/gitaly-active-saturation into master

What

  1. Update the disk selector to only check the new Gitaly nodes.
  2. Update the SLOs to be a bit lower.

Why

  1. Part of the multi-project migration we provisioned new Gitaly nodes (fqdn=~"gitaly-.*) where new repositories are only created there and we are actively moving repositories from the old gitaly servers (fqdn=~"file-.*) to the new ones.

    Updating the query to only look at the new Gitaly nodes will make sure we have an accurate prediction.

  2. At the moment we have 9 Gitaly servers so this would amount to the following:

    • Available GB per Gitaly server: 12,000GB = 16,000GB * 0.75
    • Available GB for the new fleet: 108,000GB = 12,000GB * 9
    • Soft SLO: 21,600GB = 108,000GB * 0.2
    • Hard SLO: 16,200GB = 108,000GB * 0.15
Edited by Steve Xuereb

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