azure-diagnostics

SKILL.md

Azure Diagnostics

AUTHORITATIVE GUIDANCE — MANDATORY COMPLIANCE

This document is the official source for debugging and troubleshooting Azure production issues. Follow these instructions to diagnose and resolve common Azure service problems systematically.

Triggers
Activate this skill when user wants to:

Debug or troubleshoot production issues

Diagnose errors in Azure services

Analyze application logs or metrics

Fix image pull, cold start, or health probe issues

Investigate why Azure resources are failing

Find root cause of application errors

Troubleshoot App Service issues (high CPU, deployment failures, crashes, slow responses, TLS/custom domains)

Respond to prompts like "troubleshoot app service", "app service high CPU", or "app service deployment failure"

Troubleshoot Azure Function Apps (invocation failures, timeouts, binding errors)

Find the App Insights or Log Analytics workspace linked to a Function App

Troubleshoot AKS clusters, nodes, pods, ingress, or Kubernetes networking issues

Troubleshoot Azure Messaging SDK issues (Event Hubs, Service Bus connection failures, AMQP errors, message lock issues)

Rules

Start with systematic diagnosis flow

Use AppLens (MCP) for AI-powered diagnostics when available

Check resource health before deep-diving into logs

Select appropriate troubleshooting guide based on service type

Document findings and attempted remediation steps

Route AKS incidents to the dedicated AKS troubleshooting document

Quick Diagnosis Flow

Identify symptoms - What's failing?

Check resource health - Is Azure healthy?

Review logs - What do logs show?

Analyze metrics - Performance patterns?

Investigate recent changes - What changed?

Troubleshooting Guides by Service

Service
Common Issues
Reference

Container Apps
Image pull failures, cold starts, health probes, port mismatches
container-apps/

App Service
High CPU, deployment failures, crashes, slow responses, TLS/custom domains
app-service/

Function Apps
App details, invocation failures, timeouts, binding errors, cold starts, missing app settings
functions/

AKS
Cluster access, nodes, kube-system, scheduling, crash loops, ingress, DNS, upgrades
AKS Troubleshooting

Messaging
Event Hubs & Service Bus SDK errors, AMQP failures, message lock, connectivity
Messaging Troubleshooting

Routing

Keep Container Apps and Function Apps diagnostics in this parent skill.

Route active AKS incidents, AKS-specific intake, evidence gathering, and remediation guidance to AKS Troubleshooting.

Route Azure Messaging SDK troubleshooting (Event Hubs, Service Bus) to Messaging Troubleshooting.

Quick Reference

Common Diagnostic Commands

# Check resource health
az resource show --ids RESOURCE_ID
# View activity log
az monitor activity-log list -g RG --max-events 20
# Container Apps logs
az containerapp logs show --name APP -g RG --follow
# Function App logs (query App Insights traces)
az monitor app-insights query --apps APP-INSIGHTS -g RG \
  --analytics-query "traces | where timestamp > ago(1h) | order by timestamp desc | take 50"

AppLens (MCP Tools)

For AI-powered diagnostics, use:

mcp_azure_mcp_applens
  intent: "diagnose issues with <resource-name>"
  command: "diagnose"
  parameters:
    resourceId: "<resource-id>"

Provides:
- Automated issue detection
- Root cause analysis
- Remediation recommendations

Azure Monitor (MCP Tools)

For querying logs and metrics:

mcp_azure_mcp_monitor
  intent: "query logs for <resource-name>"
  command: "logs_query"
  parameters:
    workspaceId: "<workspace-id>"
    query: "<KQL-query>"

See kql-queries.md for common diagnostic queries.

Check Azure Resource Health

Using MCP

mcp_azure_mcp_resourcehealth
  intent: "check health status of <resource-name>"
  command: "get"
  parameters:
    resourceId: "<resource-id>"

Using CLI

# Check specific resource health
az resource show --ids RESOURCE_ID

# Check recent activity
az monitor activity-log list -g RG --max-events 20

References

KQL Query Library

Azure Resource Graph Queries

App Service Troubleshooting

Function Apps Troubleshooting

Messaging Troubleshooting