Editing SLOs

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You can edit SLOs in the following ways:

• In the Nobl9 Web application
• By modifying its YAML definition and then running sloctl apply

To edit an SLO in the Nobl9 Web application, go to your required SLO details and do one of the following:

• Click (edit) to open the SLO wizard

Opening SLO wizard

• Click (more actions) > View YAML to open the code editor.
  Make your changes, keeping the Nobl9 requirements to YAML definitions

Opening SLO wizard

When editing SLOs, be aware that changing certain attributes can impact the way SLOs are calculated. The exact behavior is determined by what fields in the SLO you edit. Depending on the fields you change, you can expect one of the following outcomes:

1. Reset SLO calculations. The changes may result in losing your historical metrics data gathered for the old field values, resetting the error budget of your SLO, and removing the budget history. The SLO calculations are restarted afresh from the moment of the edit.

2. Retain SLO calculations. Calculations from the time of the edit take into account the new field values, but the error budget is not reset and the budget history is retained.

3. Reset SLO charts. The changes may result in losing your historical data displayed on the charts.

Editing SLOs – overview

The following table indicates which SLO attributes can be changed without triggering a reset (), and which cannot (). A change to any of the fields marked with will cause the SLO calculations or charts (without preserving the history) to be reset.

Field name	Resets SLO calculations	Resets charts
project 1
service
timeWindows
op
value
burnRateCondition Composite SLOs only
target
budgetingMethod
query
spec.objectives[0].name 2
displayName
description
alertPolicies
attachments
labels
maxDelay Composites 2.0 only
whenDelayed Composites 2.0 only
composite.components.objectives Composites 2.0 only

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¹ If you change the project, Nobl9 will create a new SLO with the same settings but in a different project. As such, the new SLO will be calculated from scratch.

² If you don’t specify an objective's name when creating an SLO, Nobl9 will auto-generate one. These names can be changed only once using sloctl, the Nobl9 Terraform Provider, or the Nobl9 SDK for Go! However, for auto-generated names, updating them won’t restart the error budget or charts. Check this document for more details.

tip

You can't edit the incremental setting for an already created Ratio metric SLO objective. To change this, remove the existing objective and create a new one with the correctly applied method—incremental or non-incremental.

For more information, refer to the SLO calculations guide.

moving SLOs between services

You can use sloctl to move SLOs to another service as long as they belong to the same project. To do that, apply a YAML definition for your SLO with a changed service name.