fix(sre): generate error_rate SLO entry instead of empty slos: []#48

chefgs merged 6 commits intomaincloudengine-labs/devops_os:mainfrom

copilot/bug-2-fix-empty-slos-manifestcloudengine-labs/devops_os:copilot/bug-2-fix-empty-slos-manifestCopy head branch name to clipboard