# Repair a persistently failing log-alert query before restoring its rule

> Can Azure Monitor automatically disable a log-search alert whose query keeps failing?

- Canonical URL: https://update.dsesecurity.com/updates/dse-20260909-444-repair-a-persistently-failing-log-alert-query-before-restoring-its-rule/
- Publisher: Detection Systems & Engineering (DSE Security)
- Author: DSE Security Editorial Team
- Published: 2026-09-10T00:24:32+00:00
- Modified: 2026-09-10T02:04:58+00:00
- Last reviewed by DSE: 2026-09-09
- Resource type: Guide
- DSE priority: Information
- Topics: Business Continuity, IT
- Reading time: 2 minutes

## What you need to know

Can Azure Monitor automatically disable a log-search alert whose query keeps failing?

## Potentially affected

Azure Monitor log-search alert rules with persistent evaluation failures.

## DSE recommendation

Inspect rule health and repair its query dependencies before treating the disabled rule as a notification-delivery problem.

## Article

## Source facts

Azure Monitor automatically disables a log-search alert rule when its query fails evaluation continuously for a week. An initially valid query can later fail because a referenced resource moved or was deleted, a custom table has not received its first data, or the language requirements changed. Resource Health exposes the rule’s evaluation health, and the documentation shows an Activity log disable event identifying the system action. [Microsoft Learn](https://learn.microsoft.com/en-us/azure/azure-monitor/alerts/alerts-troubleshoot-log).

## Applicability

Use this check when a rule stops evaluating or appears disabled without an intended operator change. Separate query execution, condition matching and notification delivery so investigation starts at the failed stage.

## DSE recommendation

Inspect rule health and repair its query dependencies before treating the disabled rule as a notification-delivery problem. Preserve the disable event and failed query details. Have the query owner verify referenced resources, available tables and current syntax, then agree how to restore the rule after the underlying failure is corrected. Do not repeatedly reenable an unchanged failing query.

## Verification

Run the corrected query against the intended scope and compare its results with a known test condition. After approved restoration, inspect rule health and confirm that scheduled evaluations succeed. Rehearse the alert condition separately from delivery checks, recording each outcome. Keep any period without valid evaluation visible in the monitoring record rather than interpreting silence during that period as evidence of normal service.

## Official references

[Microsoft Learn: Troubleshooting log-search alerts](https://learn.microsoft.com/en-us/azure/azure-monitor/alerts/alerts-troubleshoot-log). Source reviewed September 9, 2026.

## Primary reference

- Name: Troubleshoot log alerts in Azure Monitor - Azure Monitor | Microsoft Learn
- Authority: Microsoft Learn
- URL: https://learn.microsoft.com/en-us/azure/azure-monitor/alerts/alerts-troubleshoot-log
- Source publication date: Not stated by the source

## Citation and use

Preferred citation: “Repair a persistently failing log-alert query before restoring its rule,” DSE Security, https://update.dsesecurity.com/updates/dse-20260909-444-repair-a-persistently-failing-log-alert-query-before-restoring-its-rule/
Publishing principles: https://update.dsesecurity.com/updates/dse-updates-editorial-methodology/
Usage and citation policy: https://update.dsesecurity.com/usage/
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