observability: backend panic and maestro alerts#4869
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: geoberle The full list of commands accepted by this bot can be found here. The pull request process is described here DetailsNeeds approval from an approver in each of these files:
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* added BackendControllerPanic alert to detect panics caught by the runtime panic handler * added Maestro alerts: MaestroGRPCSourceClientExcessConnections, MaestroRESTAPIErrorRate, MaestroGRPCServerErrorRate, MaestroSpecControllerReconcileErrors * Increase PrometheusOperatorRejectedResources for duration from 5m to 20m to reduce noise during infra provisioning * known issues require less screen estate in gather-observability rendering
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