telemetry: Log a few simple data fields throughout core.

src/core/telemetry_session.h

@@ -31,7 +31,7 @@ public:
     }
 
 private:
-    Telemetry::FieldCollection field_collection; ///< Field collection, tracks all added fields
+    Telemetry::FieldCollection field_collection; ///< Tracks all added fields for the session
     std::unique_ptr<Telemetry::VisitorInterface> backend; ///< Backend interface that logs fields
 };