Client Side Caching: Add Tracking Prefix Number Stats in Server Info

src/server.c

@@ -4281,6 +4281,7 @@ sds genRedisInfoString(const char *section) {
             "active_defrag_key_misses:%lld\r\n"
             "tracking_total_keys:%lld\r\n"
             "tracking_total_items:%lld\r\n"
+            "tracking_total_prefixes:%lld\r\n"
             "unexpected_error_replies:%lld\r\n",
             server.stat_numconnections,
             server.stat_numcommands,
@@ -4311,6 +4312,7 @@ sds genRedisInfoString(const char *section) {
             server.stat_active_defrag_key_misses,
             (unsigned long long) trackingGetTotalKeys(),
             (unsigned long long) trackingGetTotalItems(),
+            (unsigned long long) trackingGetTotalPrefixes(),
             server.stat_unexpected_error_replies);
     }
 

src/server.h

@@ -1695,6 +1695,7 @@ void trackingInvalidateKeysOnFlush(int dbid);
 void trackingLimitUsedSlots(void);
 uint64_t trackingGetTotalItems(void);
 uint64_t trackingGetTotalKeys(void);
+uint64_t trackingGetTotalPrefixes(void);
 void trackingBroadcastInvalidationMessages(void);
 
 /* List data type */

src/tracking.c

@@ -518,3 +518,8 @@ uint64_t trackingGetTotalKeys(void) {
     if (TrackingTable == NULL) return 0;
     return raxSize(TrackingTable);
 }
+
+uint64_t trackingGetTotalPrefixes(void) {
+    if (PrefixTable == NULL) return 0;
+    return raxSize(PrefixTable);
+}