feat(gateway): add observability sources, series, and service log RPCs

src/gateway/server.ts

@@ -36,6 +36,7 @@ import { discoverServices } from './handlers/services.js';
 import { createModelCatalogFetcher } from './modelCatalog.js';
 import { listLocalBackendStatuses, controlLocalBackend } from './handlers/localBackends.js';
 import { listDockerDependencyStatuses, controlDockerDependency } from './handlers/dockerDependencies.js';
+import { ObservabilityCollector } from './handlers/observability.js';
 import type { TokenUsageEntry, ContextUsageEntry } from './handlers/system.js';
 import type { NodeConnectionState } from './handlers/node.js';
 import type { SessionManager } from '../session/manager.js';
@@ -172,6 +173,7 @@ export class GatewayServer {
   private canvasStore: CanvasStore;
   private metrics: MetricsCollector;
   private discoveryHandle: GatewayDiscoveryHandle | null = null;
+  private observabilityCollector: ObservabilityCollector | null = null;
   private connectionMap: Map<WebSocket, string> = new Map();
   private connectionRateMap: Map<string, {
     tokens: number;
@@ -209,6 +211,10 @@ export class GatewayServer {
   private registerHandlers(): void {
     const channelRegistry = this.config.channelRegistry;
     const runtimeConfig = this.config.config;
+    this.observabilityCollector = runtimeConfig
+      ? new ObservabilityCollector({ config: runtimeConfig })
+      : null;
+    const observabilityCollector = this.observabilityCollector;
     const modelCatalogFetcher = runtimeConfig ? createModelCatalogFetcher(runtimeConfig) : undefined;
     const systemHandlers = createSystemHandlers({
       startTime: this.startTime,
@@ -244,6 +250,15 @@ export class GatewayServer {
       controlDockerDependency: runtimeConfig
         ? (dependency, action) => controlDockerDependency(runtimeConfig, dependency, action)
         : undefined,
+      getObservabilitySources: observabilityCollector
+        ? () => observabilityCollector.listSources()
+        : undefined,
+      getObservabilitySeries: observabilityCollector
+        ? (opts) => observabilityCollector.getSeries(opts)
+        : undefined,
+      getServiceLogs: observabilityCollector
+        ? (opts) => observabilityCollector.getServiceLogs(opts)
+        : undefined,
       getPresence: channelRegistry
         ? (opts) => channelRegistry.getPresence(opts)
         : undefined,
@@ -547,6 +562,7 @@ export class GatewayServer {
     const { port } = this.config;
 
     return new Promise((resolve) => {
+      this.observabilityCollector?.start();
       // Create HTTP server first — handles static file requests
       this.httpServer = createServer((req: IncomingMessage, res: ServerResponse) => {
         this.handleHttpRequest(req, res);
@@ -584,6 +600,8 @@ export class GatewayServer {
   }
 
   async stop(): Promise<void> {
+    this.observabilityCollector?.stop();
+
     if (this.discoveryHandle) {
       try {
         await this.discoveryHandle.stop();