yairgil introduces the new public preview feature of query-based metric alerts in Azure Monitor, showcasing advanced monitoring and alerting options for Azure users and developers.

Announcing Public Preview: Query-Based Metric Alerts in Azure Monitor

Azure Monitor metric alerts now offer comprehensive coverage for all metrics in your monitoring environment—including Azure platform metrics, Prometheus, and OpenTelemetry custom metrics. These improvements empower you to:

Write advanced queries and conditions using PromQL,
Detect complex event patterns,
Monitor workloads at scale, and
Customize alert notifications in ways not previously possible.

Key Benefits

Full Metrics Coverage: Query-based metric alerts now support all Azure metrics, including custom metrics ingested from Prometheus and OpenTelemetry workloads.
PromQL-Driven Conditions: Apply PromQL syntax to select, aggregate, and transform metrics for robust alerting scenarios.
Sophisticated Event Detection: Identify complex relationships and patterns across multiple timeseries, perform change detection, aggregation, and time-based comparisons.
Flexible Scoping: Choose resource-centric (for granular RBAC) or workspace-centric (cross-resource) alert rules.
Scalable Alerting: Build rules that monitor metrics across many resources, subscriptions, or entire resource groups.
Managed Identity Support: Use Azure Managed Identity for secure, compliant queries without manual credential management.
Customizable Alerts: Set dynamic custom properties and email subjects to streamline triage and contextualize alerts for your team.
Community Integration: Import and use community PromQL alert queries for standard or custom scenarios.

Supported Metrics

Query-based metric alerts work with any metrics available in Azure Monitor Workspaces, including:

Metrics from Azure Monitor Managed Service for Prometheus — perfect for AKS clusters and other Prometheus sources.
Virtual Machine OpenTelemetry Guest OS Metrics.
Other OpenTelemetry custom metrics ingested into Azure Monitor.

Threshold-based metric alerts remain supported for platform metrics, with query-based alerts on platform metrics coming soon.

Comparison: Query-Based Metric Alerts vs Prometheus Rule Groups

Feature	Azure Prometheus Rule Groups	Query-Based Metric Alerts
Alert rule management	Part of a rule group resource	Independent Azure resource
Supported metrics	Managed Prometheus only	Managed Prometheus, OTel metrics
Condition logic	PromQL	PromQL
Aggregation & transformation	Full PromQL	Full PromQL
Scope	Workspace-wide	Resource-centric or workspace-wide
Alerting at scale	Not supported	Subscription/resource group level
Cross-resource conditions	Supported	Supported
RBAC granularity	Workspace level	Resource or workspace level
Managed identity support	Not supported	Supported
Notification customization	Label/annotation-based	Dynamic properties, emails

This comparison demonstrates the increased power, flexibility, and native Azure integration of query-based metric alerts, making them suitable for modern monitoring needs.

Getting Started

If you have an Azure Monitor workspace with Prometheus or OpenTelemetry metrics, you can create query-based metric alert rules now using:

Azure Portal
ARM templates
Azure REST API

For full setup details and documentation, visit the Azure Monitor query-based metric alerts overview.

Stay tuned for further enhancements to this feature in upcoming releases.

Published by yairgil, Microsoft

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