Implement a function to retrieve the expansive clients mem usage.

src/server.c

@@ -920,6 +920,18 @@ int clientsCronTrackExpansiveClients(client *c) {
     return 0; /* This function never terminates the client. */
 }
 
+/* Return the max samples in the memory usage of clients tracked by
+ * the function clientsCronTrackExpansiveClients(). */
+void getExpansiveClientsInfo(size_t *in_usage, size_t *out_usage) {
+    size_t i = 0, o = 0;
+    for (int j = 0; j < CLIENTS_PEAK_MEM_USAGE_SLOTS; j++) {
+        if (ClientsPeakMemInput[j] > i) i = ClientsPeakMemInput[j];
+        if (ClientsPeakMemOutput[j] > o) o = ClientsPeakMemOutput[o];
+    }
+    *in_usage = i;
+    *out_usage = o;
+}
+
 #define CLIENTS_CRON_MIN_ITERATIONS 5
 void clientsCron(void) {
     /* Make sure to process at least numclients/server.hz of clients