logic-app-failed-trigger-count-app-insights.kql

traces
| where customDimensions.EventName == "WorkflowTriggerEnd"
| where customDimensions.prop__status == "Failed"
| extend resource =  parse_json(tostring(parse_json(tostring(customDimensions.prop__properties)).resource))
| project timestamp 
    , LogicApp = tostring(cloud_RoleName)
    , Workflow = tostring(resource.workflowName)
| summarize Count = count()
    by bin(timestamp, 1d),
    Workflow
| render barchart
| sort by timestamp desc