Gap-6: App Service Diagnose (B → A) — Dedicated troubleshooting guide#1640
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Gap-6: App Service Diagnose (B → A) — Dedicated troubleshooting guide#1640
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Pull request overview
Adds a dedicated App Service troubleshooting reference covering common App Service symptoms, diagnostic commands (Azure CLI/Kudu), KQL queries, and MCP tool guidance to support “Gap-6: App Service Diagnose (B → A)”.
Changes:
- Introduces a symptom → cause → quick fix matrix for common App Service failures.
- Adds step-by-step sections with Azure CLI commands and KQL queries for CPU/memory, deployments, crashes, latency, and TLS/custom domains.
- Documents relevant MCP tools and includes a “combined diagnostic script” snippet.
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| | Symptom | Likely Cause | Quick Fix | | ||
| |---------|--------------|-----------| | ||
| | High CPU / memory | Runaway process, inefficient code | Use Process Explorer via Kudu, scale up | | ||
| | Deployment failure | Build error, locked files, quota | Check Kudu logs at `https://APP.scm.azurewebsites.net/api/deployments` | | ||
| | App crash / restart | Unhandled exception, OOM kill | Review Event Log and STDERR in Diagnose & Solve | | ||
| | Slow responses | Downstream dependency, no caching | Enable request tracing, check dependency calls | | ||
| | 502 / 503 errors | App not starting, port conflict | Check STDERR logs, verify startup command | | ||
| | TLS / domain errors | Certificate expired, DNS mismatch | `az webapp config ssl list`, verify CNAME | | ||
| | Health check failure | Endpoint not returning 200 | Verify health check path responds within 2 min | |
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The markdown tables use a double leading pipe (||), which renders as an extra empty first column in most markdown renderers and breaks the intended 3-column layout. Use a single leading | for each row (and ideally a trailing |) so the tables render consistently.
| --metric "CpuPercentage,MemoryPercentage" --interval PT1M --output table | ||
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| # View running processes via Kudu REST API | ||
| curl -u '$USER:$PASS' https://APP.scm.azurewebsites.net/api/processes |
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Using single quotes prevents shell variable expansion, so this will literally send the username $USER and password $PASS rather than their values. Use double quotes (or omit quotes) so $USER/$PASS expand correctly.
Suggested change
| curl -u '$USER:$PASS' https://APP.scm.azurewebsites.net/api/processes | |
| curl -u "$USER:$PASS" https://APP.scm.azurewebsites.net/api/processes |
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| ``` | ||
| mcp_azure_mcp_applens |
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The AppLens tool identifier is inconsistent between the invocation example (mcp_azure_mcp_applens) and the MCP tools table (azure-mcp-applens). Align these names so readers know exactly what to call, and consider adding a language hint (e.g., yaml) to the fenced block to make the example format explicit.
Suggested change
| ``` | |
| mcp_azure_mcp_applens | |
| ```yaml | |
| azure-mcp-applens |
Contributor
Details# 🔍 Token Analysis Report
fatal: path 'plugin/skills/azure-diagnostics/references/app-service/README.md' exists on disk, but not in 'origin/main' 📊 Token Change ReportComparing Summary
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references/subdirectories.
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Closes #1614 | Parent: #1608
1 file: app-service/README.md — High CPU, deployment failures, crashes, slow responses, TLS issues. MCP tool usage guide. KQL queries. Symptom/cause/fix tables.