fix(feishu): cache probeFeishu() results with 10-min TTL to reduce API calls (openclaw#28907) thanks @Glucksberg

Verified:
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: Glucksberg <80581902+Glucksberg@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

extensions/feishu/src/probe.ts

@@ -1,6 +1,14 @@
 import { createFeishuClient, type FeishuClientCredentials } from "./client.js";
 import type { FeishuProbeResult } from "./types.js";
 
+/** Cache successful probe results to reduce API calls (bot info is static).
+ * Gateway health checks call probeFeishu() every minute; without caching this
+ * burns ~43,200 calls/month, easily exceeding Feishu's free-tier quota.
+ * A 10-min TTL cuts that to ~4,320 calls/month. (#26684) */
+const probeCache = new Map<string, { result: FeishuProbeResult; expiresAt: number }>();
+const PROBE_CACHE_TTL_MS = 10 * 60 * 1000; // 10 minutes
+const MAX_PROBE_CACHE_SIZE = 64;
+
 export async function probeFeishu(creds?: FeishuClientCredentials): Promise<FeishuProbeResult> {
   if (!creds?.appId || !creds?.appSecret) {
     return {
@@ -9,6 +17,16 @@ export async function probeFeishu(creds?: FeishuClientCredentials): Promise<Feis
     };
   }
 
+  // Return cached result if still valid.
+  // Use accountId when available; otherwise include appSecret prefix so two
+  // accounts sharing the same appId (e.g. after secret rotation) don't
+  // pollute each other's cache entry.
+  const cacheKey = creds.accountId ?? `${creds.appId}:${creds.appSecret.slice(0, 8)}`;
+  const cached = probeCache.get(cacheKey);
+  if (cached && cached.expiresAt > Date.now()) {
+    return cached.result;
+  }
+
   try {
     const client = createFeishuClient(creds);
     // Use bot/v3/info API to get bot information
@@ -28,12 +46,24 @@ export async function probeFeishu(creds?: FeishuClientCredentials): Promise<Feis
     }
 
     const bot = response.bot || response.data?.bot;
-    return {
+    const result: FeishuProbeResult = {
       ok: true,
       appId: creds.appId,
       botName: bot?.bot_name,
       botOpenId: bot?.open_id,
     };
+
+    // Cache successful results only
+    probeCache.set(cacheKey, { result, expiresAt: Date.now() + PROBE_CACHE_TTL_MS });
+    // Evict oldest entry if cache exceeds max size
+    if (probeCache.size > MAX_PROBE_CACHE_SIZE) {
+      const oldest = probeCache.keys().next().value;
+      if (oldest !== undefined) {
+        probeCache.delete(oldest);
+      }
+    }
+
+    return result;
   } catch (err) {
     return {
       ok: false,
@@ -42,3 +72,8 @@ export async function probeFeishu(creds?: FeishuClientCredentials): Promise<Feis
     };
   }
 }
+
+/** Clear the probe cache (for testing). */
+export function clearProbeCache(): void {
+  probeCache.clear();
+}