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Composite SLO

Are the calculations of error budgets weighted?​

  • The calculations are not weighted.

What does the burn rate for composite SLO represent?​

  • It’s representing the results of the calculations as described in Composite SLOs and error budget calculations.
  • The logic of those calculations is the same for composite SLOs as for regular (standard) objectives and SLOs. Read more about Glossary: Error budget burn rate.
  • The only differences in the calculations are as follows:
    • SLI comes from the Nobl9 app, not from the agent or direct. Possible SLIs are:
      • burn rate for Occurrences (the same as on the charts on SLO details)
      • good or bad minute for Time Slices - these values are not presented on any chart; they are used to calculate burn rates and error budgets
    • burnRateCondition used for determining if the error budget will burn

Does it matter for a composite SLO if there is one or many objectives with a burn rate greater than the burn rate condition?​

  • One objective satisfying burn rate condition causes the budget for a composite SLO to burn at the same rate.

Do objective calculations restart when I change the SLO type to composite SLO?​

  • Calculations for the objectives are not restarted. Enabling a composite SLO does not cause any loss of results or chart data.
  • Changing the burn rate condition causes the charts for the composite SLO to reset the calculations as for a standard objective when the objective value is changed.

Is objective's historical data included in calculations for composite SLO charts?​

  • Nobl9 does not calculate data for composite SLOs charts by using objective's historical data. Creating composite SLO is similar to creating a new objective—only new incoming data is used during calculations.
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