Add custom dashboard for server stats and tool calls

[pamelafox]

Fixes #15

After this change, you can run "azd monitor" to see this custom dashboard pop-up:

The tool call charts are based off KQL queries based off the gen_ai attribute names.

[Copilot]

Pull request overview

This PR adds a custom Azure Portal dashboard for monitoring MCP server statistics and tool calls, addressing issue #15. The dashboard provides visualizations for tool call counts, success rates, latency percentiles, and per-tool usage metrics using KQL queries against Application Insights telemetry data. Additionally, it optimizes infrastructure by conditionally creating Cosmos DB containers only when authentication is enabled.

• Adds custom Azure Portal dashboard with charts for tool metrics (counts, success/error rates, latency percentiles, and per-tool breakdowns)
• Conditionally creates auth-related Cosmos DB containers only when authentication is enabled (Keycloak or Entra OAuth Proxy)
• Updates documentation to explain how to access the dashboard via azd monitor

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

File	Description
infra/appinsights-dashboard.bicep	New Bicep module defining Azure Portal dashboard with 10 tiles visualizing MCP tool call metrics and server performance using KQL queries
infra/main.bicep	Adds authEnabled variable and conditionally creates Cosmos DB containers for user-expenses and oauth-clients only when auth is enabled; integrates dashboard module
servers/opentelemetry_middleware.py	Removes historical comment about PR #2083 that's no longer needed
README.md	Documents azd monitor command to access the dashboard and clarifies Application Insights access steps

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[madebygps]

lgtm