feat(monitoring): add frontend and backend protocol distribution metrics to network stats

ts/opsserver/handlers/stats.handler.ts

@@ -311,6 +311,8 @@ export class StatsHandler {
                   requestsPerSecond: stats.requestsPerSecond || 0,
                   requestsTotal: stats.requestsTotal || 0,
                   backends: stats.backends || [],
+                  frontendProtocols: stats.frontendProtocols || null,
+                  backendProtocols: stats.backendProtocols || null,
                 };
               })()
             );