Add Glean telemetry to MCP server #2324
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This adds a way to track MCP endpoint usage by sending lightweight Glean event pings on initialize and tool calls. Since
@mozilla/gleanonly ships browser bundles (no Node.js entry point), we handcraft the ping payload and POST it directly to the ingestion endpoint. This is a quick hack to set up the monitoring as soon as possible, later on I'll look into moving this to use the SDK.Events:
mcp.initialize(client info),mcp.tool_call(tool, app, success). Pings validated against the officialglean v1schema in tests.I have tested this locally with submissions to Debug Viewer: https://debug-ping-preview.firebaseapp.com/stream/mcp-test
See https://mozilla-hub.atlassian.net/browse/DENG-10652