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For example, SLA met vs breached
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Select Customize & View to customise the report using filters and date ranges.Once satisfied, click Apply to view your SLA statistics.Once the report is selected, use the Show drop-down to select a time period for the report.
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References
Atlassian Documentation on Jira Service Desk Reports: Atlassian Documentation
Explanation of SLAs: Service Level Agreements in Jira Service Desk