diff --git a/collector/lib/CollectorStatsExporter.cpp b/collector/lib/CollectorStatsExporter.cpp
index ee628c8eb6..324d3f2231 100644
--- a/collector/lib/CollectorStatsExporter.cpp
+++ b/collector/lib/CollectorStatsExporter.cpp
@@ -58,6 +58,21 @@ void CollectorStatsExporter::run() {
   auto& preemptions = collectorEventCounters.Add({{"type", "preemptions"}});
   auto& grpcSendFailures = collectorEventCounters.Add({{"type", "grpcSendFailures"}});
   auto& threadTableSize = collectorEventCounters.Add({{"type", "threadCacheSize"}});
+  auto& procLookups = collectorEventCounters.Add({{"type", "procLookups"}});
+  auto& mainThreadLookups = collectorEventCounters.Add({{"type", "mainThreadLookups"}});
+  auto& procLookupsDurationNs = collectorEventCounters.Add({{"type", "procLookupsDurationNs"}});
+
+  auto& fdCacheHits = collectorEventCounters.Add({{"type", "fdCacheHits"}});
+  auto& fdCacheMisses = collectorEventCounters.Add({{"type", "fdCacheMisses"}});
+  auto& fdLookupFailures = collectorEventCounters.Add({{"type", "fdLookupFailures"}});
+  auto& fdsAdded = collectorEventCounters.Add({{"type", "fdsAdded"}});
+  auto& fdsRemoved = collectorEventCounters.Add({{"type", "fdsRemoved"}});
+
+  auto& threadCacheHits = collectorEventCounters.Add({{"type", "threadCacheHits"}});
+  auto& threadCacheMisses = collectorEventCounters.Add({{"type", "threadCacheMisses"}});
+  auto& threadLookupFailures = collectorEventCounters.Add({{"type", "threadLookupFailures"}});
+  auto& threadsAdded = collectorEventCounters.Add({{"type", "threadsAdded"}});
+  auto& threadsRemoved = collectorEventCounters.Add({{"type", "threadsRemoved"}});
 
   auto& processSent = collectorEventCounters.Add({{"type", "processSent"}});
   auto& processSendFailures = collectorEventCounters.Add({{"type", "processSendFailures"}});
@@ -170,6 +185,21 @@ void CollectorStatsExporter::run() {
     ringbufferDrops.Set(stats.nDropsBuffer);
     preemptions.Set(stats.nPreemptions);
     threadTableSize.Set(stats.nThreadCacheSize);
+    procLookups.Set(stats.nProcLookups);
+    mainThreadLookups.Set(stats.nMainThreadLookups);
+    procLookupsDurationNs.Set(stats.nProcLookupsDurationNs);
+
+    fdCacheHits.Set(stats.nFdCacheHits);
+    fdCacheMisses.Set(stats.nFdCacheMisses);
+    fdLookupFailures.Set(stats.nFdLookupFailures);
+    fdsAdded.Set(stats.nFdsAdded);
+    fdsRemoved.Set(stats.nFdsRemoved);
+
+    threadCacheHits.Set(stats.nThreadCacheHits);
+    threadCacheMisses.Set(stats.nThreadCacheMisses);
+    threadLookupFailures.Set(stats.nThreadLookupFailures);
+    threadsAdded.Set(stats.nThreadsAdded);
+    threadsRemoved.Set(stats.nThreadsRemoved);
 
     if (config_->EnableDetailedMetrics()) {
       uint64_t nUserspace = 0;
diff --git a/collector/lib/system-inspector/Service.cpp b/collector/lib/system-inspector/Service.cpp
index 95c0394416..f874467f4f 100644
--- a/collector/lib/system-inspector/Service.cpp
+++ b/collector/lib/system-inspector/Service.cpp
@@ -357,9 +357,24 @@ bool Service::GetStats(system_inspector::Stats* stats) const {
   stats->nDropsBuffer = kernel_stats.n_drops_buffer;
   stats->nPreemptions = kernel_stats.n_preemptions;
   stats->nThreadCacheSize = inspector_->m_thread_manager->get_thread_count();
+  stats->nProcLookups = inspector_->m_thread_manager->get_m_n_proc_lookups();
+  stats->nMainThreadLookups = inspector_->m_thread_manager->get_m_n_main_thread_lookups();
+  stats->nProcLookupsDurationNs = inspector_->m_thread_manager->get_m_n_proc_lookups_duration_ns();
 
   if (userspace_stats != nullptr) {
     stats->nDropsThreadCache = userspace_stats->m_n_drops_full_threadtable;
+
+    stats->nFdCacheHits = userspace_stats->m_n_cached_fd_lookups;
+    stats->nFdCacheMisses = userspace_stats->m_n_noncached_fd_lookups;
+    stats->nFdLookupFailures = userspace_stats->m_n_failed_fd_lookups;
+    stats->nFdsAdded = userspace_stats->m_n_added_fds;
+    stats->nFdsRemoved = userspace_stats->m_n_removed_fds;
+
+    stats->nThreadCacheHits = userspace_stats->m_n_cached_thread_lookups;
+    stats->nThreadCacheMisses = userspace_stats->m_n_noncached_thread_lookups;
+    stats->nThreadLookupFailures = userspace_stats->m_n_failed_thread_lookups;
+    stats->nThreadsAdded = userspace_stats->m_n_added_threads;
+    stats->nThreadsRemoved = userspace_stats->m_n_removed_threads;
   }
 
   return true;
diff --git a/collector/lib/system-inspector/SystemInspector.h b/collector/lib/system-inspector/SystemInspector.h
index 247da3f223..0883d1b127 100644
--- a/collector/lib/system-inspector/SystemInspector.h
+++ b/collector/lib/system-inspector/SystemInspector.h
@@ -25,6 +25,24 @@ struct Stats {
   volatile uint64_t nThreadCacheSize = 0;                   // number of thread-info entries stored in the cache
   volatile uint64_t nDropsThreadCache = 0;                  // the number of drops due to full thread cache
 
+  // libsinsp fdtable/threadtable state counters (from sinsp_stats_v2)
+  volatile uint64_t nFdCacheHits = 0;       // cached fd lookups
+  volatile uint64_t nFdCacheMisses = 0;     // non-cached fd lookups
+  volatile uint64_t nFdLookupFailures = 0;  // failed fd lookups
+  volatile uint64_t nFdsAdded = 0;          // fds added to fdtables
+  volatile uint64_t nFdsRemoved = 0;        // fds removed from fdtables
+
+  volatile uint64_t nThreadCacheHits = 0;       // cached thread lookups
+  volatile uint64_t nThreadCacheMisses = 0;     // non-cached thread lookups
+  volatile uint64_t nThreadLookupFailures = 0;  // failed thread lookups
+  volatile uint64_t nThreadsAdded = 0;          // threads added to the thread table
+  volatile uint64_t nThreadsRemoved = 0;        // threads removed from the thread table
+
+  // number of times a thread lookup fell back to a direct /proc scan (sinsp_thread_manager)
+  volatile uint64_t nProcLookups = 0;            // total /proc lookups performed
+  volatile uint64_t nMainThreadLookups = 0;      // /proc lookups performed specifically for main threads
+  volatile uint64_t nProcLookupsDurationNs = 0;  // total time spent performing /proc lookups
+
   // process related metrics
   volatile uint64_t nProcessSent = 0;                       // number of process signals sent
   volatile uint64_t nProcessSendFailures = 0;               // number of process signals failed to send