stacklok / toolhive / 20041675862

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Instrument vMCP and Document o11y Configuration (#2906)

This PR adds metrics and distributed tracing to the Virtual MCP Server (vMCP), providing visibility into backend calls and composite workflow executions.

Implementation

Add telemetry.go with decorator pattern for instrumenting backend clients and workflow executors
Instrument the vMCP server with the existing telemetry middleware.
Emit metrics for backend requests (request count, errors, duration) and workflow executions
Create distributed tracing spans for backend operations and workflow executions
Plumb telemetry configuration from VirtualMCPServer CRD to the vMCP server
Metrics Emitted
toolhive_vmcp_backends_discovered - Number of backends discovered
toolhive_vmcp_backend_requests - Request count per backend
toolhive_vmcp_backend_errors - Error count per backend
toolhive_vmcp_backend_requests_duration - Request duration histogram
toolhive_vmcp_workflow_executionsl - Workflow execution count
toolhive_vmcp_workflow_errors - Workflow error count
toolhive_vmcp_workflow_duration - Workflow duration histogram

documentation and test for e2e emission.
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Signed-off-by: Jeremy Drouillard <jeremy@stacklok.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jerm-dro <10532181+jerm-dro@users.noreply.github.com>
Co-authored-by: Jakub Hrozek <jakub.hrozek@posteo.se>

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